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第 7 章 描述 RHOSO 高可用性服务的 statefulset

OpenShift (RHOSO)高可用性服务的 Operator 创建和管理 有状态集。

statefulset 执行以下任务：

  • 管理每个服务的一组 pod 的部署和扩展。
  • 为每个 pod 维护一个粘性身份。这意味着每个 pod 都有一个唯一且持久的网络标识符，它会在任何重新调度过程中维护。
  • 为服务提供持久性存储。
  • 实施服务的滚动更新，以防止服务中断。

您可以检索有关每个服务的 statefulset 的以下信息，该服务被组织在以下部分中：

  • 有关服务的基本信息。例如，副本数量。
  • 实际的容器详情。例如，环境变量。
  • 卷详情：为此服务提供的持久性存储。
  • 事件详情： 有状态集 事件，可用于故障排除。
注意

在描述它们前，您必须始终列出共享 control plane 服务的 statefulset 名称，因为有时 statefulset 的名称与共享 control plane 服务的名称不同。

流程

  1. 您可以使用以下命令列出 Galera、RabbitMQ 和 memcached 共享 control plane 服务的 statefulset 名称： 

    $ oc get statefulset |egrep -e "galera|rabbit|memcache"
NAME                      			READY   AGE
memcached                 			1/1 	174m
openstack-cell1-galera    		3/3 	174m
openstack-galera          		3/3 	174m
rabbitmq-cell1-server     		3/3 	174m
rabbitmq-server           		3/3 	174m
    Copy to Clipboard Toggle word wrap

  2. 您可以使用以下命令描述共享 control plane 服务的 statefulset ： 

    $ oc describe statefulset <statefulset_name>
    Copy to Clipboard Toggle word wrap

    • 将 <statefulset_name > 替换为从上一命令检索的 statefulset 的名称。

      例如，以下命令检索 openstack-galera statefulset 的信息： 

      $ oc describe statefulset openstack-galera
      Copy to Clipboard Toggle word wrap

  3. statefulset 中包含的信息被组织到以下部分：

    • 基本服务信息，这是您看到的信息的第一个部分： 

      Name:           	openstack-galera
Namespace:      	openstack
CreationTimestamp:  Thu, 21 Mar 2024 08:39:59 -0400
Selector:       	app=galera,cr=galera-openstack,galera/name=openstack,galera/namespace=openstack,galera/uid=1c93b3a3-1ac3-4f18-984d-34e9ce9dc12f,owner=mariadb-operator
Labels:         	<none>
Annotations:    	<none>
Replicas:       	3 desired | 3 total
Update Strategy:	RollingUpdate
  Partition:    	0
Pods Status:    	3 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
  Labels:       	app=galera
                	cr=galera-openstack
                	galera/name=openstack
                	galera/namespace=openstack
                	galera/uid=1c93b3a3-1ac3-4f18-984d-34e9ce9dc12f
                	owner=mariadb-operator
  Service Account:  galera-openstack
  Init Containers:
   mysql-bootstrap:
	Image:  	quay.io/podified-antelope-centos9/openstack-mariadb@sha256:7fa37f7dcdd850fb6e401c4d5f76d16ad53ecdd14d6a130dbf61f02b819dcdf6
	Port:   	<none>
	Host Port:  <none>
	Command:
  	bash
  	/var/lib/operator-scripts/mysql_bootstrap.sh
	Environment:
  	KOLLA_BOOTSTRAP:    	True
  	KOLLA_CONFIG_STRATEGY:  COPY_ALWAYS
  	DB_ROOT_PASSWORD:   	<set to the key 'DbRootPassword' in secret 'osp-secret'>  Optional: false
	Mounts:
  	/var/lib/config-data/default from config-data-default (ro)
  	/var/lib/config-data/generated from config-data-generated (rw)
  	/var/lib/kolla/config_files from kolla-config (ro)
  	/var/lib/mysql from mysql-db (rw)
  	/var/lib/operator-scripts from operator-scripts (ro)
  	/var/lib/secrets from secrets (ro)
... [cont]
      Copy to Clipboard Toggle word wrap

    • 容器，提供有关此服务容器的信息： 

       Containers:
   galera:
	Image:   	quay.io/podified-antelope-centos9/openstack-mariadb@sha256:7fa37f7dcdd850fb6e401c4d5f76d16ad53ecdd14d6a130dbf61f02b819dcdf6
	Ports:   	3306/TCP, 4567/TCP
	Host Ports:  0/TCP, 0/TCP
	Command:
  	/usr/bin/dumb-init
  	--
  	/usr/local/bin/kolla_start
	Liveness:   exec [/bin/bash /var/lib/operator-scripts/mysql_probe.sh liveness] delay=0s timeout=1s period=10s #success=1 #failure=3
	Readiness:  exec [/bin/bash /var/lib/operator-scripts/mysql_probe.sh readiness] delay=0s timeout=1s period=10s #success=1 #failure=3
	Startup:	exec [/bin/bash /var/lib/operator-scripts/mysql_probe.sh startup] delay=0s timeout=1s period=10s #success=1 #failure=30
	Environment:
  	CR_CONFIG_HASH:     	n558hf6h557hcfh589h688h684hb6h687h679h659h554h64fh77h76h568h695h5b6h8fh79h5c8h648h674hdch556h56bh655h64bh655h66ch5h5c4q
  	KOLLA_CONFIG_STRATEGY:  COPY_ALWAYS
  	DB_ROOT_PASSWORD:   	<set to the key 'DbRootPassword' in secret 'osp-secret'>  Optional: false
	Mounts:
  	/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem from combined-ca-bundle (ro,path="tls-ca-bundle.pem")
  	/var/lib/config-data/default from config-data-default (ro)
  	/var/lib/config-data/generated from config-data-generated (rw)
  	/var/lib/config-data/tls/certs/galera.crt from galera-tls-certs (ro,path="tls.crt")
  	/var/lib/config-data/tls/private/galera.key from galera-tls-certs (ro,path="tls.key")
  	/var/lib/kolla/config_files from kolla-config (ro)
  	/var/lib/mysql from mysql-db (rw)
  	/var/lib/operator-scripts from operator-scripts (ro)
  	/var/lib/secrets from secrets (ro)
... [cont]
      Copy to Clipboard Toggle word wrap

    • 卷，它提供有关为此服务提供的持久性存储卷的信息： 

       Volumes:
   secrets:
	Type:    	Secret (a volume populated by a Secret)
	SecretName:  osp-secret
	Optional:	false
   kolla-config:
	Type:  	ConfigMap (a volume populated by a ConfigMap)
	Name:  	openstack-config-data
	Optional:  false
   config-data-generated:
	Type:   	EmptyDir (a temporary directory that shares a pod's lifetime)
	Medium:
	SizeLimit:  <unset>
   config-data-default:
	Type:  	ConfigMap (a volume populated by a ConfigMap)
	Name:  	openstack-config-data
	Optional:  false
   operator-scripts:
	Type:  	ConfigMap (a volume populated by a ConfigMap)
	Name:  	openstack-scripts
	Optional:  false
   galera-tls-certs:
	Type:    	Secret (a volume populated by a Secret)
	SecretName:  cert-galera-openstack-svc
	Optional:	false
   combined-ca-bundle:
	Type:    	Secret (a volume populated by a Secret)
	SecretName:  combined-ca-bundle
	Optional:	false
Volume Claims:
  Name:      	mysql-db
  StorageClass:  local-storage
  Labels:    	app=galera
             	cr=galera-openstack
             	galera/name=openstack
             	galera/namespace=openstack
             	galera/uid=1c93b3a3-1ac3-4f18-984d-34e9ce9dc12f
             	owner=mariadb-operator
  Annotations:   <none>
  Capacity:  	5G
  Access Modes:  [ReadWriteOnce]
... [cont]
      Copy to Clipboard Toggle word wrap

    • 事件，提供此服务的 statefulset 事件： 

      Events:
  Type	Reason        	Age   From                	Message
  ----	------        	----  ----                	-------
  Normal  SuccessfulCreate  179m  statefulset-controller  create Claim mysql-db-openstack-galera-0 Pod openstack-galera-0 in statefulset openstack-galera success
  Normal  SuccessfulCreate  179m  statefulset-controller  create Pod openstack-galera-0 in statefulset openstack-galera successful
  Normal  SuccessfulCreate  179m  statefulset-controller  create Claim mysql-db-openstack-galera-1 Pod openstack-galera-1 in statefulset openstack-galera success
  Normal  SuccessfulCreate  179m  statefulset-controller  create Claim mysql-db-openstack-galera-2 Pod openstack-galera-2 in statefulset openstack-galera success
  Normal  SuccessfulCreate  179m  statefulset-controller  create Pod openstack-galera-1 in statefulset openstack-galera successful
  Normal  SuccessfulCreate  179m  statefulset-controller  create Pod openstack-galera-2 in statefulset openstack-galera successful
      Copy to Clipboard Toggle word wrap
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