655 lines
19 KiB
Go
655 lines
19 KiB
Go
package cluster
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import (
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"encoding/json"
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"fmt"
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"sort"
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/intstr"
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"k8s.io/client-go/pkg/api/v1"
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"k8s.io/client-go/pkg/apis/apps/v1beta1"
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policybeta1 "k8s.io/client-go/pkg/apis/policy/v1beta1"
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"github.com/zalando-incubator/postgres-operator/pkg/spec"
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"github.com/zalando-incubator/postgres-operator/pkg/util/constants"
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)
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const (
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pgBinariesLocationTemplate = "/usr/lib/postgresql/%s/bin"
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patroniPGBinariesParameterName = "bin_dir"
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patroniPGParametersParameterName = "parameters"
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localHost = "127.0.0.1/32"
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)
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type pgUser struct {
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Password string `json:"password"`
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Options []string `json:"options"`
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}
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type patroniDCS struct {
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TTL uint32 `json:"ttl,omitempty"`
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LoopWait uint32 `json:"loop_wait,omitempty"`
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RetryTimeout uint32 `json:"retry_timeout,omitempty"`
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MaximumLagOnFailover float32 `json:"maximum_lag_on_failover,omitempty"`
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}
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type pgBootstrap struct {
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Initdb []interface{} `json:"initdb"`
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Users map[string]pgUser `json:"users"`
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PgHBA []string `json:"pg_hba"`
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DCS patroniDCS `json:"dcs,omitempty"`
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}
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type spiloConfiguration struct {
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PgLocalConfiguration map[string]interface{} `json:"postgresql"`
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Bootstrap pgBootstrap `json:"bootstrap"`
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}
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func (c *Cluster) containerName() string {
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return c.Name
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}
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func (c *Cluster) statefulSetName() string {
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return c.Name
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}
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func (c *Cluster) endpointName(role PostgresRole) string {
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name := c.Name
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if role == Replica {
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name = name + "-repl"
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}
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return name
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}
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func (c *Cluster) serviceName(role PostgresRole) string {
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name := c.Name
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if role == Replica {
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name = name + "-repl"
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}
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return name
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}
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func (c *Cluster) podDisruptionBudgetName() string {
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return c.OpConfig.PDBNameFormat.Format("cluster", c.Name)
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}
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func (c *Cluster) resourceRequirements(resources spec.Resources) (*v1.ResourceRequirements, error) {
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var err error
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specRequests := resources.ResourceRequest
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specLimits := resources.ResourceLimits
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config := c.OpConfig
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defaultRequests := spec.ResourceDescription{CPU: config.DefaultCPURequest, Memory: config.DefaultMemoryRequest}
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defaultLimits := spec.ResourceDescription{CPU: config.DefaultCPULimit, Memory: config.DefaultMemoryLimit}
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result := v1.ResourceRequirements{}
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result.Requests, err = fillResourceList(specRequests, defaultRequests)
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if err != nil {
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return nil, fmt.Errorf("could not fill resource requests: %v", err)
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}
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result.Limits, err = fillResourceList(specLimits, defaultLimits)
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if err != nil {
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return nil, fmt.Errorf("could not fill resource limits: %v", err)
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}
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return &result, nil
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}
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func fillResourceList(spec spec.ResourceDescription, defaults spec.ResourceDescription) (v1.ResourceList, error) {
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var err error
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requests := v1.ResourceList{}
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if spec.CPU != "" {
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requests[v1.ResourceCPU], err = resource.ParseQuantity(spec.CPU)
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if err != nil {
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return nil, fmt.Errorf("could not parse CPU quantity: %v", err)
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}
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} else {
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requests[v1.ResourceCPU], err = resource.ParseQuantity(defaults.CPU)
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if err != nil {
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return nil, fmt.Errorf("could not parse default CPU quantity: %v", err)
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}
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}
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if spec.Memory != "" {
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requests[v1.ResourceMemory], err = resource.ParseQuantity(spec.Memory)
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if err != nil {
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return nil, fmt.Errorf("could not parse memory quantity: %v", err)
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}
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} else {
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requests[v1.ResourceMemory], err = resource.ParseQuantity(defaults.Memory)
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if err != nil {
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return nil, fmt.Errorf("could not parse default memory quantity: %v", err)
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}
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}
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return requests, nil
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}
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func (c *Cluster) generateSpiloJSONConfiguration(pg *spec.PostgresqlParam, patroni *spec.Patroni) string {
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config := spiloConfiguration{}
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config.Bootstrap = pgBootstrap{}
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config.Bootstrap.Initdb = []interface{}{map[string]string{"auth-host": "md5"},
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map[string]string{"auth-local": "trust"}}
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initdbOptionNames := []string{}
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for k := range patroni.InitDB {
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initdbOptionNames = append(initdbOptionNames, k)
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}
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/* We need to sort the user-defined options to more easily compare the resulting specs */
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sort.Strings(initdbOptionNames)
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// Initdb parameters in the manifest take priority over the default ones
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// The whole type switch dance is caused by the ability to specify both
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// maps and normal string items in the array of initdb options. We need
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// both to convert the initial key-value to strings when necessary, and
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// to de-duplicate the options supplied.
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PatroniInitDBParams:
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for _, k := range initdbOptionNames {
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v := patroni.InitDB[k]
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for i, defaultParam := range config.Bootstrap.Initdb {
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switch defaultParam.(type) {
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case map[string]string:
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{
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for k1 := range defaultParam.(map[string]string) {
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if k1 == k {
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(config.Bootstrap.Initdb[i]).(map[string]string)[k] = v
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continue PatroniInitDBParams
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}
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}
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}
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case string:
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{
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/* if the option already occurs in the list */
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if defaultParam.(string) == v {
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continue PatroniInitDBParams
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}
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}
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default:
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c.logger.Warningf("unsupported type for initdb configuration item %s: %T", defaultParam, defaultParam)
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continue PatroniInitDBParams
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}
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}
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// The following options are known to have no parameters
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if v == "true" {
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switch k {
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case "data-checksums", "debug", "no-locale", "noclean", "nosync", "sync-only":
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config.Bootstrap.Initdb = append(config.Bootstrap.Initdb, k)
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continue
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}
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}
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config.Bootstrap.Initdb = append(config.Bootstrap.Initdb, map[string]string{k: v})
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}
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// pg_hba parameters in the manifest replace the default ones. We cannot
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// reasonably merge them automatically, because pg_hba parsing stops on
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// a first successfully matched rule.
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if len(patroni.PgHba) > 0 {
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config.Bootstrap.PgHBA = patroni.PgHba
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} else {
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config.Bootstrap.PgHBA = []string{
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"hostnossl all all all reject",
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fmt.Sprintf("hostssl all +%s all pam", c.OpConfig.PamRoleName),
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"hostssl all all all md5",
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}
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}
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if patroni.MaximumLagOnFailover >= 0 {
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config.Bootstrap.DCS.MaximumLagOnFailover = patroni.MaximumLagOnFailover
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}
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if patroni.LoopWait != 0 {
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config.Bootstrap.DCS.LoopWait = patroni.LoopWait
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}
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if patroni.RetryTimeout != 0 {
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config.Bootstrap.DCS.RetryTimeout = patroni.RetryTimeout
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}
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if patroni.TTL != 0 {
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config.Bootstrap.DCS.TTL = patroni.TTL
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}
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config.PgLocalConfiguration = make(map[string]interface{})
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config.PgLocalConfiguration[patroniPGBinariesParameterName] = fmt.Sprintf(pgBinariesLocationTemplate, pg.PgVersion)
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if len(pg.Parameters) > 0 {
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config.PgLocalConfiguration[patroniPGParametersParameterName] = pg.Parameters
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}
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config.Bootstrap.Users = map[string]pgUser{
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c.OpConfig.PamRoleName: {
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Password: "",
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Options: []string{constants.RoleFlagCreateDB, constants.RoleFlagNoLogin},
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},
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}
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result, err := json.Marshal(config)
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if err != nil {
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c.logger.Errorf("cannot convert spilo configuration into JSON: %v", err)
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return ""
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}
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return string(result)
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}
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func (c *Cluster) nodeAffinity() *v1.Affinity {
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matchExpressions := make([]v1.NodeSelectorRequirement, 0)
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for k, v := range c.OpConfig.EOLNodeLabel {
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matchExpressions = append(matchExpressions, v1.NodeSelectorRequirement{
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Key: k,
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Operator: v1.NodeSelectorOpNotIn,
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Values: []string{v},
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})
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}
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return &v1.Affinity{
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NodeAffinity: &v1.NodeAffinity{
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RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
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NodeSelectorTerms: []v1.NodeSelectorTerm{{MatchExpressions: matchExpressions}},
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},
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},
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}
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}
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func (c *Cluster) tolerations(tolerationsSpec *[]v1.Toleration) []v1.Toleration {
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// allow to override tolerations by postgresql manifest
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if len(*tolerationsSpec) > 0 {
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return *tolerationsSpec
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}
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podToleration := c.Config.OpConfig.PodToleration
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if (len(podToleration["key"]) > 0 || len(podToleration["operator"]) > 0 || len(podToleration["value"]) > 0 || len(podToleration["effect"]) > 0) {
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return []v1.Toleration{
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{
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Key: podToleration["key"],
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Operator: v1.TolerationOperator(podToleration["operator"]),
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Value: podToleration["value"],
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Effect: v1.TaintEffect(podToleration["effect"]),
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},
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}
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} else {
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return []v1.Toleration{}
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}
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}
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func (c *Cluster) generatePodTemplate(resourceRequirements *v1.ResourceRequirements,
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tolerationsSpec *[]v1.Toleration,
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pgParameters *spec.PostgresqlParam,
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patroniParameters *spec.Patroni,
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cloneDescription *spec.CloneDescription) *v1.PodTemplateSpec {
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spiloConfiguration := c.generateSpiloJSONConfiguration(pgParameters, patroniParameters)
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envVars := []v1.EnvVar{
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{
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Name: "SCOPE",
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Value: c.Name,
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},
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{
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Name: "PGROOT",
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Value: constants.PostgresDataPath,
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},
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{
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Name: "POD_IP",
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ValueFrom: &v1.EnvVarSource{
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FieldRef: &v1.ObjectFieldSelector{
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APIVersion: "v1",
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FieldPath: "status.podIP",
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},
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},
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},
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{
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Name: "POD_NAMESPACE",
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ValueFrom: &v1.EnvVarSource{
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FieldRef: &v1.ObjectFieldSelector{
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APIVersion: "v1",
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FieldPath: "metadata.namespace",
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},
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},
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},
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{
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Name: "PGUSER_SUPERUSER",
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Value: c.OpConfig.SuperUsername,
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},
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{
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Name: "PGPASSWORD_SUPERUSER",
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ValueFrom: &v1.EnvVarSource{
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SecretKeyRef: &v1.SecretKeySelector{
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LocalObjectReference: v1.LocalObjectReference{
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Name: c.credentialSecretName(c.OpConfig.SuperUsername),
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},
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Key: "password",
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},
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},
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},
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{
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Name: "PGUSER_STANDBY",
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Value: c.OpConfig.ReplicationUsername,
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},
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{
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Name: "PGPASSWORD_STANDBY",
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ValueFrom: &v1.EnvVarSource{
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SecretKeyRef: &v1.SecretKeySelector{
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LocalObjectReference: v1.LocalObjectReference{
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Name: c.credentialSecretName(c.OpConfig.ReplicationUsername),
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},
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Key: "password",
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},
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},
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},
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{
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Name: "PAM_OAUTH2",
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Value: c.OpConfig.PamConfiguration,
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},
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}
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if spiloConfiguration != "" {
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envVars = append(envVars, v1.EnvVar{Name: "SPILO_CONFIGURATION", Value: spiloConfiguration})
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}
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if c.OpConfig.WALES3Bucket != "" {
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envVars = append(envVars, v1.EnvVar{Name: "WAL_S3_BUCKET", Value: c.OpConfig.WALES3Bucket})
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}
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if c.OpConfig.EtcdHost == "" {
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envVars = append(envVars, v1.EnvVar{Name: "DCS_ENABLE_KUBERNETES_API", Value: "true"})
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} else {
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envVars = append(envVars, v1.EnvVar{Name: "ETCD_HOST", Value: c.OpConfig.EtcdHost})
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}
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if cloneDescription.ClusterName != "" {
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envVars = append(envVars, c.generateCloneEnvironment(cloneDescription)...)
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}
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privilegedMode := true
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container := v1.Container{
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Name: c.containerName(),
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Image: c.OpConfig.DockerImage,
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ImagePullPolicy: v1.PullIfNotPresent,
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Resources: *resourceRequirements,
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Ports: []v1.ContainerPort{
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{
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ContainerPort: 8008,
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Protocol: v1.ProtocolTCP,
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},
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{
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ContainerPort: 5432,
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Protocol: v1.ProtocolTCP,
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},
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{
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ContainerPort: 8080,
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Protocol: v1.ProtocolTCP,
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},
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},
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VolumeMounts: []v1.VolumeMount{
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{
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Name: constants.DataVolumeName,
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MountPath: constants.PostgresDataMount, //TODO: fetch from manifesto
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},
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},
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Env: envVars,
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SecurityContext: &v1.SecurityContext{
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Privileged: &privilegedMode,
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},
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}
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terminateGracePeriodSeconds := int64(c.OpConfig.PodTerminateGracePeriod.Seconds())
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podSpec := v1.PodSpec{
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ServiceAccountName: c.OpConfig.ServiceAccountName,
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TerminationGracePeriodSeconds: &terminateGracePeriodSeconds,
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Containers: []v1.Container{container},
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Affinity: c.nodeAffinity(),
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Tolerations: c.tolerations(tolerationsSpec),
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}
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template := v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: c.labelsSet(),
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Namespace: c.Namespace,
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},
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Spec: podSpec,
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}
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if c.OpConfig.KubeIAMRole != "" {
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template.Annotations = map[string]string{constants.KubeIAmAnnotation: c.OpConfig.KubeIAMRole}
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}
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return &template
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}
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func (c *Cluster) generateStatefulSet(spec *spec.PostgresSpec) (*v1beta1.StatefulSet, error) {
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resourceRequirements, err := c.resourceRequirements(spec.Resources)
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if err != nil {
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return nil, fmt.Errorf("could not generate resource requirements: %v", err)
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}
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podTemplate := c.generatePodTemplate(resourceRequirements, &spec.Tolerations, &spec.PostgresqlParam, &spec.Patroni, &spec.Clone)
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volumeClaimTemplate, err := generatePersistentVolumeClaimTemplate(spec.Volume.Size, spec.Volume.StorageClass)
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if err != nil {
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return nil, fmt.Errorf("could not generate volume claim template: %v", err)
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}
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statefulSet := &v1beta1.StatefulSet{
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ObjectMeta: metav1.ObjectMeta{
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Name: c.statefulSetName(),
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Namespace: c.Namespace,
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Labels: c.labelsSet(),
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},
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Spec: v1beta1.StatefulSetSpec{
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Replicas: &spec.NumberOfInstances,
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ServiceName: c.serviceName(Master),
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Template: *podTemplate,
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VolumeClaimTemplates: []v1.PersistentVolumeClaim{*volumeClaimTemplate},
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},
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}
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return statefulSet, nil
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}
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func generatePersistentVolumeClaimTemplate(volumeSize, volumeStorageClass string) (*v1.PersistentVolumeClaim, error) {
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metadata := metav1.ObjectMeta{
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Name: constants.DataVolumeName,
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}
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if volumeStorageClass != "" {
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// TODO: check if storage class exists
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metadata.Annotations = map[string]string{"volume.beta.kubernetes.io/storage-class": volumeStorageClass}
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} else {
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metadata.Annotations = map[string]string{"volume.alpha.kubernetes.io/storage-class": "default"}
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}
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quantity, err := resource.ParseQuantity(volumeSize)
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if err != nil {
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return nil, fmt.Errorf("could not parse volume size: %v", err)
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}
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volumeClaim := &v1.PersistentVolumeClaim{
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ObjectMeta: metadata,
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Spec: v1.PersistentVolumeClaimSpec{
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AccessModes: []v1.PersistentVolumeAccessMode{v1.ReadWriteOnce},
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceStorage: quantity,
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},
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},
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},
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}
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return volumeClaim, nil
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}
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func (c *Cluster) generateUserSecrets() (secrets map[string]*v1.Secret) {
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secrets = make(map[string]*v1.Secret, len(c.pgUsers))
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namespace := c.Namespace
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for username, pgUser := range c.pgUsers {
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//Skip users with no password i.e. human users (they'll be authenticated using pam)
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secret := c.generateSingleUserSecret(namespace, pgUser)
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if secret != nil {
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secrets[username] = secret
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}
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}
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/* special case for the system user */
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for _, systemUser := range c.systemUsers {
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secret := c.generateSingleUserSecret(namespace, systemUser)
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if secret != nil {
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secrets[systemUser.Name] = secret
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}
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}
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return
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}
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func (c *Cluster) generateSingleUserSecret(namespace string, pgUser spec.PgUser) *v1.Secret {
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//Skip users with no password i.e. human users (they'll be authenticated using pam)
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if pgUser.Password == "" {
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return nil
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}
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username := pgUser.Name
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secret := v1.Secret{
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ObjectMeta: metav1.ObjectMeta{
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Name: c.credentialSecretName(username),
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Namespace: namespace,
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Labels: c.labelsSet(),
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},
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Type: v1.SecretTypeOpaque,
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Data: map[string][]byte{
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"username": []byte(pgUser.Name),
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"password": []byte(pgUser.Password),
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},
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}
|
|
return &secret
|
|
}
|
|
|
|
func (c *Cluster) generateService(role PostgresRole, spec *spec.PostgresSpec) *v1.Service {
|
|
var dnsName string
|
|
|
|
if role == Master {
|
|
dnsName = c.masterDNSName()
|
|
} else {
|
|
dnsName = c.replicaDNSName()
|
|
}
|
|
|
|
serviceSpec := v1.ServiceSpec{
|
|
Ports: []v1.ServicePort{{Name: "postgresql", Port: 5432, TargetPort: intstr.IntOrString{IntVal: 5432}}},
|
|
Type: v1.ServiceTypeClusterIP,
|
|
}
|
|
|
|
if role == Replica {
|
|
serviceSpec.Selector = c.roleLabelsSet(role)
|
|
}
|
|
|
|
var annotations map[string]string
|
|
|
|
// Examine the per-cluster load balancer setting, if it is not defined - check the operator configuration.
|
|
if (spec.UseLoadBalancer != nil && *spec.UseLoadBalancer) ||
|
|
(spec.UseLoadBalancer == nil && c.OpConfig.EnableLoadBalancer) {
|
|
|
|
// safe default value: lock load balancer to only local address unless overridden explicitly.
|
|
sourceRanges := []string{localHost}
|
|
allowedSourceRanges := spec.AllowedSourceRanges
|
|
if len(allowedSourceRanges) >= 0 {
|
|
sourceRanges = allowedSourceRanges
|
|
}
|
|
|
|
serviceSpec.Type = v1.ServiceTypeLoadBalancer
|
|
serviceSpec.LoadBalancerSourceRanges = sourceRanges
|
|
|
|
annotations = map[string]string{
|
|
constants.ZalandoDNSNameAnnotation: dnsName,
|
|
constants.ElbTimeoutAnnotationName: constants.ElbTimeoutAnnotationValue,
|
|
}
|
|
}
|
|
|
|
service := &v1.Service{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: c.serviceName(role),
|
|
Namespace: c.Namespace,
|
|
Labels: c.roleLabelsSet(role),
|
|
Annotations: annotations,
|
|
},
|
|
Spec: serviceSpec,
|
|
}
|
|
|
|
return service
|
|
}
|
|
|
|
func (c *Cluster) generateEndpoint(role PostgresRole, subsets []v1.EndpointSubset) *v1.Endpoints {
|
|
endpoints := &v1.Endpoints{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: c.endpointName(role),
|
|
Namespace: c.Namespace,
|
|
Labels: c.roleLabelsSet(role),
|
|
},
|
|
}
|
|
if len(subsets) > 0 {
|
|
endpoints.Subsets = subsets
|
|
}
|
|
|
|
return endpoints
|
|
}
|
|
|
|
func (c *Cluster) generateCloneEnvironment(description *spec.CloneDescription) []v1.EnvVar {
|
|
result := make([]v1.EnvVar, 0)
|
|
|
|
if description.ClusterName == "" {
|
|
return result
|
|
}
|
|
|
|
cluster := description.ClusterName
|
|
result = append(result, v1.EnvVar{Name: "CLONE_SCOPE", Value: cluster})
|
|
if description.EndTimestamp == "" {
|
|
// cloning with basebackup, make a connection string to the cluster to clone from
|
|
host, port := c.getClusterServiceConnectionParameters(cluster)
|
|
// TODO: make some/all of those constants
|
|
result = append(result, v1.EnvVar{Name: "CLONE_METHOD", Value: "CLONE_WITH_BASEBACKUP"})
|
|
result = append(result, v1.EnvVar{Name: "CLONE_HOST", Value: host})
|
|
result = append(result, v1.EnvVar{Name: "CLONE_PORT", Value: port})
|
|
// TODO: assume replication user name is the same for all clusters, fetch it from secrets otherwise
|
|
result = append(result, v1.EnvVar{Name: "CLONE_USER", Value: c.OpConfig.ReplicationUsername})
|
|
result = append(result,
|
|
v1.EnvVar{Name: "CLONE_PASSWORD",
|
|
ValueFrom: &v1.EnvVarSource{
|
|
SecretKeyRef: &v1.SecretKeySelector{
|
|
LocalObjectReference: v1.LocalObjectReference{
|
|
Name: c.credentialSecretNameForCluster(c.OpConfig.ReplicationUsername,
|
|
description.ClusterName),
|
|
},
|
|
Key: "password",
|
|
},
|
|
},
|
|
})
|
|
} else {
|
|
// cloning with S3, find out the bucket to clone
|
|
result = append(result, v1.EnvVar{Name: "CLONE_METHOD", Value: "CLONE_WITH_WALE"})
|
|
result = append(result, v1.EnvVar{Name: "CLONE_WAL_S3_BUCKET", Value: c.OpConfig.WALES3Bucket})
|
|
result = append(result, v1.EnvVar{Name: "CLONE_TARGET_TIME", Value: description.EndTimestamp})
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
func (c *Cluster) generatePodDisruptionBudget() *policybeta1.PodDisruptionBudget {
|
|
minAvailable := intstr.FromInt(1)
|
|
|
|
return &policybeta1.PodDisruptionBudget{
|
|
ObjectMeta: metav1.ObjectMeta{
|
|
Name: c.podDisruptionBudgetName(),
|
|
Namespace: c.Namespace,
|
|
Labels: c.labelsSet(),
|
|
},
|
|
Spec: policybeta1.PodDisruptionBudgetSpec{
|
|
MinAvailable: &minAvailable,
|
|
Selector: &metav1.LabelSelector{
|
|
MatchLabels: c.roleLabelsSet(Master),
|
|
},
|
|
},
|
|
}
|
|
}
|
|
|
|
// getClusterServiceConnectionParameters fetches cluster host name and port
|
|
// TODO: perhaps we need to query the service (i.e. if non-standard port is used?)
|
|
// TODO: handle clusters in different namespaces
|
|
func (c *Cluster) getClusterServiceConnectionParameters(clusterName string) (host string, port string) {
|
|
host = clusterName
|
|
port = "5432"
|
|
return
|
|
}
|