docker swarm 使用示例

╰半橙微兮° 2022-11-29 14:28 164阅读 0赞

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### docker swarm 使用示例 ###

**节点 1：192.168.57.120**

**节点 2：****192.168.57.127**

### \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* ###

**集群操作**

**创建集群：docker swarm init**

[root@centos ~]# docker swarm init
    Swarm initialized: current node (sv2g7ljrt9leiw0caet9d9wj5) is now a manager.
    
    To add a worker to this swarm, run the following command:
    
        docker swarm join --token SWMTKN-1-2k0pyekm18le5xn3s4nm8wee115r89eibropgdj55idb5vtjx7-6s2bwk6xgcoguravw3efdxwv4 192.168.57.127:2377
    
    To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

**添加worker node，在对应节点执行命令** ：docker swarm join --token ...

**添加manager node，当前节点执行命令**：docker swarm join-token manager，再执行后续操作

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**添加worker node**

**192.168.57.120****执行如下命令**

[root@centos ~]# docker swarm join --token SWMTKN-1-2k0pyekm18le5xn3s4nm8wee115r89eibropgdj55idb5vtjx7-6s2bwk6xgcoguravw3efdxwv4 192.168.57.127:2377
    This node joined a swarm as a worker.

**节点作为worker node加入集群**

**查看节点：docker node ls**

[root@centos ~]# docker node ls
    ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
    51kgawqwx5hp3ytl55m9g8mcf     centos              Ready               Active                                  19.03.6-rc2
    sv2g7ljrt9leiw0caet9d9wj5 *   centos              Ready               Active              Leader              19.03.13-beta2
    [

**说明：查看节点需要在manager node上执行**

**manager node查看集群信息：docker info**

[root@centos ~]# docker info
    Client:
     Debug Mode: false
    
    Server:
     Containers: 0
      Running: 0
      Paused: 0
      Stopped: 0
     Images: 40
     Server Version: 19.03.13-beta2
     Storage Driver: overlay2
      Backing Filesystem: xfs
      Supports d_type: true
      Native Overlay Diff: true
     Logging Driver: json-file
     Cgroup Driver: cgroupfs
     Plugins:
      Volume: local
      Network: bridge host ipvlan macvlan null overlay
      Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
     Swarm: active
      NodeID: sv2g7ljrt9leiw0caet9d9wj5
      Is Manager: true
      ClusterID: 4ehmddg5fn49wjz9zi88fi3pe
      Managers: 1
      Nodes: 2
      Default Address Pool: 10.0.0.0/8  
      SubnetSize: 24
      Data Path Port: 4789
      Orchestration:
       Task History Retention Limit: 5
      Raft:
       Snapshot Interval: 10000
       Number of Old Snapshots to Retain: 0
       Heartbeat Tick: 1
       Election Tick: 10
      Dispatcher:
       Heartbeat Period: 5 seconds
      CA Configuration:
       Expiry Duration: 3 months
       Force Rotate: 0
      Autolock Managers: false
      Root Rotation In Progress: false
      Node Address: 192.168.57.127
      Manager Addresses:
       192.168.57.127:2377
     Runtimes: runc
     Default Runtime: runc
     Init Binary: docker-init
     containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
     runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
     init version: fec3683
     Security Options:
      seccomp
       Profile: default
     Kernel Version: 3.10.0-1127.18.2.el7.x86_64
     Operating System: CentOS Linux 7 (Core)
     OSType: linux
     Architecture: x86_64
     CPUs: 1
     Total Memory: 1.777GiB
     Name: centos
     ID: OW47:PHLP:5MHC:TKKD:REMM:YJJL:5OWX:GJI4:HQPJ:QEY4:MK6Z:IBZD
     Docker Root Dir: /var/lib/docker
     Debug Mode: false
     Username: lihu12344
     Registry: https://index.docker.io/v1/
     Labels:
      provider=generic
     Experimental: false
     Insecure Registries:
      127.0.0.0/8
     Registry Mirrors:
      https://rbp1yphj.mirror.aliyuncs.com/
     Live Restore Enabled: false

**managers：**1、**nodes：**2 **==> 集群中1个manager node，共2个节点**

**node address：**192.168.57.127 **==> 当前节点ip地址**

**manager addresses：**192.168.57.120:2377 **==> manager 节点 ip地址**

**worker node 查看集群信息：docker info**

**is manager:false****==>**** 当前节点不为manager**

**node address: 192.168.57.120 ==> 当前节点ip**

**manager addresses: 192.168.57.127:2377 ==> manager 节点 ip地址**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**添加 manager node**

**192.168.57.120 退出集群：docker swarm leave -f**

**manager node 192.168.57.127 执行命令：docker swarm join-token manager**

[root@centos ~]# docker swarm join-token manager
    To add a manager to this swarm, run the following command:
    
        docker swarm join --token SWMTKN-1-2k0pyekm18le5xn3s4nm8wee115r89eibropgdj55idb5vtjx7-0hfio4cb9wqk95nipipq5g7ii 192.168.57.127:2377

**192.168.57.120 作为manager node加入**

[root@centos ~]# docker swarm join --token SWMTKN-1-2k0pyekm18le5xn3s4nm8wee115r89eibropgdj55idb5vtjx7-0hfio4cb9wqk95nipipq5g7ii 192.168.57.127:2377
    This node joined a swarm as a manager.

**查看节点：docker node ls**

[root@centos ~]# docker node ls
    ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
    51kgawqwx5hp3ytl55m9g8mcf     centos              Down                Active                                  19.03.6-rc2
    ewa94hkxarjjkuydx2jq2y3bm *   centos              Ready               Active              Reachable           19.03.6-rc2
    sv2g7ljrt9leiw0caet9d9wj5     centos              Ready               Active              Leader              19.03.13-beta2

**说明：status 为down的节点为192.168.57.120退出集群导致**

**查看集群信息：docker info**

[root@centos ~]# docker info
    Client:
     Debug Mode: false
    
    Server:
     Containers: 4
      Running: 0
      Paused: 0
      Stopped: 4
     Images: 39
     Server Version: 19.03.6-rc2
     Storage Driver: overlay2
      Backing Filesystem: xfs
      Supports d_type: true
      Native Overlay Diff: true
     Logging Driver: json-file
     Cgroup Driver: cgroupfs
     Plugins:
      Volume: local
      Network: bridge host ipvlan macvlan null overlay
      Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
     Swarm: active
      NodeID: ewa94hkxarjjkuydx2jq2y3bm
      Is Manager: true
      ClusterID: 4ehmddg5fn49wjz9zi88fi3pe
      Managers: 2
      Nodes: 3
      Default Address Pool: 10.0.0.0/8  
      SubnetSize: 24
      Data Path Port: 4789
      Orchestration:
       Task History Retention Limit: 5
      Raft:
       Snapshot Interval: 10000
       Number of Old Snapshots to Retain: 0
       Heartbeat Tick: 1
       Election Tick: 10
      Dispatcher:
       Heartbeat Period: 5 seconds
      CA Configuration:
       Expiry Duration: 3 months
       Force Rotate: 0
      Autolock Managers: false
      Root Rotation In Progress: false
      Node Address: 192.168.57.120
      Manager Addresses:
       192.168.57.120:2377
       192.168.57.127:2377
     Runtimes: runc
     Default Runtime: runc
     Init Binary: docker-init
     containerd version: b34a5c8af56e510852c35414db4c1f4fa6172339
     runc version: 3e425f80a8c931f88e6d94a8c831b9d5aa481657
     init version: fec3683
     Security Options:
      seccomp
       Profile: default
     Kernel Version: 3.10.0-957.el7.x86_64
     Operating System: CentOS Linux 7 (Core)
     OSType: linux
     Architecture: x86_64
     CPUs: 1
     Total Memory: 1.777GiB
     Name: centos
     ID: GJSG:3CFX:XLTR:YOJU:ZOOL:QBES:YWSR:JRFH:TWXR:W5CM:Y2Y5:H2B5
     Docker Root Dir: /var/lib/docker
     Debug Mode: false
     Username: lihu12344
     Registry: https://index.docker.io/v1/
     Labels:
     Experimental: false
     Insecure Registries:
      127.0.0.0/8
     Registry Mirrors:
      https://rbp1yphj.mirror.aliyuncs.com/
     Live Restore Enabled: false
    
    WARNING: Running Swarm in a two-manager configuration. This configuration provides
             no fault tolerance, and poses a high risk to lose control over the cluster.
             Refer to https://docs.docker.com/engine/swarm/admin_guide/ to configure the
             Swarm for fault-tolerance.

**managers：2、nodes：3 ==> 管理节点有2个，共有3个节点**

**is manager：true ==> 当前节点为manager 节点**

**node address： 192.168.57.120 ==>** **当前节点的ip地址为 192.168.57.120**

**manager addresses：192.168.57.120:2377、192.168.57.127:2377 ==> 管理节点的ip地址**

### \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* ###

**服务操作**

**创建服务**

[root@centos ~]# docker service create -p 6379:6379 --replicas 1 --name redis redis
    rvodfdouqjqrl9dnzcgpeiw4v
    overall progress: 1 out of 1 tasks 
    1/1: running   [==================================================>] 
    verify: Service converged

**说明：创建服务操作需要在manager node上执行**

**查看服务列表：docker service ls**

[root@centos ~]# docker service ls
    ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
    rvodfdouqjqr        redis               replicated          1/1                 redis:latest        *:6379->6379/tcp

**查看服务运行信息：docker service ps redis**

[root@centos ~]# docker service ps redis
    ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE           ERROR               PORTS
    ma4ifebdonse        redis.1             redis:latest        centos              Running             Running 3 minutes ago

**查看服务日志：docker service logs redis**

[root@centos ~]# docker service logs redis
    redis.1.ma4ifebdonse@centos    | 1:C 22 Aug 2020 02:41:19.210 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
    redis.1.ma4ifebdonse@centos    | 1:C 22 Aug 2020 02:41:19.210 # Redis version=6.0.6, bits=64, commit=00000000, modified=0, pid=1, just started
    redis.1.ma4ifebdonse@centos    | 1:C 22 Aug 2020 02:41:19.210 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
    redis.1.ma4ifebdonse@centos    | 1:M 22 Aug 2020 02:41:19.214 * Running mode=standalone, port=6379.
    redis.1.ma4ifebdonse@centos    | 1:M 22 Aug 2020 02:41:19.215 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
    redis.1.ma4ifebdonse@centos    | 1:M 22 Aug 2020 02:41:19.215 # Server initialized
    redis.1.ma4ifebdonse@centos    | 1:M 22 Aug 2020 02:41:19.215 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
    redis.1.ma4ifebdonse@centos    | 1:M 22 Aug 2020 02:41:19.215 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
    redis.1.ma4ifebdonse@centos    | 1:M 22 Aug 2020 02:41:19.216 * Ready to accept connections

**更新服务，副本数变为2：docker service update --replicas 2 redis**

[root@centos ~]# docker service update --replicas 2 redis
    redis
    overall progress: 2 out of 2 tasks 
    1/2: running   [==================================================>] 
    2/2: running   [==================================================>] 
    verify: Service converged

**查看服务：docker service ps redis**

[root@centos ~]# docker service ps redis
    ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE             ERROR                              PORTS
    ma4ifebdonse        redis.1             redis:latest        centos              Running             Running 11 minutes ago                                       
    d7nkflpyw8ds        redis.2             redis:latest        centos              Running             Running 23 seconds ago

**副本数变为2**

**查看服务详细信息：docker service inspect redis**

[root@centos ~]# docker service inspect redis
    [
        {
            "ID": "rvodfdouqjqrl9dnzcgpeiw4v",
            "Version": {
                "Index": 24
            },
            "CreatedAt": "2020-08-22T02:41:13.095574991Z",
            "UpdatedAt": "2020-08-22T02:52:06.00798984Z",
            "Spec": {
                "Name": "redis",
                "Labels": {},
                "TaskTemplate": {
                    "ContainerSpec": {
                        "Image": "redis:latest@sha256:09c33840ec47815dc0351f1eca3befe741d7105b3e95bc8fdb9a7e4985b9e1e5",
                        "Init": false,
                        "StopGracePeriod": 10000000000,
                        "DNSConfig": {},
                        "Isolation": "default"
                    },
                    "Resources": {
                        "Limits": {},
                        "Reservations": {}
                    },
                    "RestartPolicy": {
                        "Condition": "any",
                        "Delay": 5000000000,
                        "MaxAttempts": 0
                    },
                    "Placement": {
                        "Platforms": [
                            {
                                "Architecture": "amd64",
                                "OS": "linux"
                            },
                            {
                                "OS": "linux"
                            },
                            {
                                "OS": "linux"
                            },
                            {
                                "Architecture": "arm64",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "386",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "mips64le",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "ppc64le",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "s390x",
                                "OS": "linux"
                            }
                        ]
                    },
                    "ForceUpdate": 0,
                    "Runtime": "container"
                },
                "Mode": {
                    "Replicated": {
                        "Replicas": 2
                    }
                },
                "UpdateConfig": {
                    "Parallelism": 1,
                    "FailureAction": "pause",
                    "Monitor": 5000000000,
                    "MaxFailureRatio": 0,
                    "Order": "stop-first"
                },
                "RollbackConfig": {
                    "Parallelism": 1,
                    "FailureAction": "pause",
                    "Monitor": 5000000000,
                    "MaxFailureRatio": 0,
                    "Order": "stop-first"
                },
                "EndpointSpec": {
                    "Mode": "vip",
                    "Ports": [
                        {
                            "Protocol": "tcp",
                            "TargetPort": 6379,
                            "PublishedPort": 6379,
                            "PublishMode": "ingress"
                        }
                    ]
                }
            },
            "PreviousSpec": {
                "Name": "redis",
                "Labels": {},
                "TaskTemplate": {
                    "ContainerSpec": {
                        "Image": "redis:latest@sha256:09c33840ec47815dc0351f1eca3befe741d7105b3e95bc8fdb9a7e4985b9e1e5",
                        "Init": false,
                        "DNSConfig": {},
                        "Isolation": "default"
                    },
                    "Resources": {
                        "Limits": {},
                        "Reservations": {}
                    },
                    "Placement": {
                        "Platforms": [
                            {
                                "Architecture": "amd64",
                                "OS": "linux"
                            },
                            {
                                "OS": "linux"
                            },
                            {
                                "OS": "linux"
                            },
                            {
                                "Architecture": "arm64",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "386",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "mips64le",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "ppc64le",
                                "OS": "linux"
                            },
                            {
                                "Architecture": "s390x",
                                "OS": "linux"
                            }
                        ]
                    },
                    "ForceUpdate": 0,
                    "Runtime": "container"
                },
                "Mode": {
                    "Replicated": {
                        "Replicas": 1
                    }
                },
                "EndpointSpec": {
                    "Mode": "vip",
                    "Ports": [
                        {
                            "Protocol": "tcp",
                            "TargetPort": 6379,
                            "PublishedPort": 6379,
                            "PublishMode": "ingress"
                        }
                    ]
                }
            },
            "Endpoint": {
                "Spec": {
                    "Mode": "vip",
                    "Ports": [
                        {
                            "Protocol": "tcp",
                            "TargetPort": 6379,
                            "PublishedPort": 6379,
                            "PublishMode": "ingress"
                        }
                    ]
                },
                "Ports": [
                    {
                        "Protocol": "tcp",
                        "TargetPort": 6379,
                        "PublishedPort": 6379,
                        "PublishMode": "ingress"
                    }
                ],
                "VirtualIPs": [
                    {
                        "NetworkID": "0yjl71w64xlkfw5ititsuao1z",
                        "Addr": "10.0.0.4/24"
                    }
                ]
            }
        }
    ]

**服务回滚：docker service rollback redis**

[root@centos ~]# docker service rollback redis
    redis
    service rolled back: rollback completed

**查看服务信息：docker service ps redis**

[root@centos ~]# docker service ps redis
    ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE            ERROR               PORTS
    ma4ifebdonse        redis.1             redis:latest        centos              Running             Running 16 minutes ago

**副本数回滚为1**