Consul - 安装运行

工作中用到Consul，把基本的概念和使用研究一下。

安装

[root@Automation ~]# cd /usr/local/bin
[root@Automation bin]# sudo wget https://releases.hashicorp.com/consul/1.0.2/consul_1.0.2_linux_386.zip
[root@Automation bin]# sudo unzip consul_1.0.2_linux_386.zip

验证：

[root@Automation bin]# consul
Usage: consul [--version] [--help] <command> [<args>]

Available commands are:
    agent          Runs a Consul agent
    catalog        Interact with the catalog
    event          Fire a new event
    exec           Executes a command on Consul nodes
    force-leave    Forces a member of the cluster to enter the "left" state
    info           Provides debugging information for operators.
    join           Tell Consul agent to join cluster
    keygen         Generates a new encryption key
    keyring        Manages gossip layer encryption keys
    kv             Interact with the key-value store
    leave          Gracefully leaves the Consul cluster and shuts down
    lock           Execute a command holding a lock
    maint          Controls node or service maintenance mode
    members        Lists the members of a Consul cluster
    monitor        Stream logs from a Consul agent
    operator       Provides cluster-level tools for Consul operators
    reload         Triggers the agent to reload configuration files
    rtt            Estimates network round trip time between nodes
    snapshot       Saves, restores and inspects snapshots of Consul server state
    validate       Validate config files/directories
    version        Prints the Consul version
    watch          Watch for changes in Consul

运行代理

在Consul安装完成后，要先运行代理。该代理可以以服务器或者客户端模式运行。每个数据中心必须有至少一个服务器，不过一个集群推荐3或5个服务器。

启动代理

通过Docke启动Consul容器

[root@Automation bin]# consul agent -dev==> Starting Consul agent...==> Consul agent running!           Version: 'v1.0.2'           Node ID: 'a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3'         Node name: 'Automation'        Datacenter: 'dc1' (Segment: '<all>')            Server: true (Bootstrap: false)       Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 8600)      Cluster Addr: 127.0.0.1 (LAN: 8301, WAN: 8302)           Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false==> Log data will now stream in as it occurs:    2017/12/25 15:25:25 [DEBUG] Using random ID "a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3" as node ID    2017/12/25 15:25:25 [INFO] raft: Initial configuration (index=1): [{Suffrage:Voter ID:a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3 Address:127.0.0.1:8300}]
==> Starting Consul agent...
==> Consul agent running!
           Version: 'v1.0.2'
           Node ID: 'a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3'
         Node name: 'Automation'
        Datacenter: 'dc1' (Segment: '<all>')
            Server: true (Bootstrap: false)
       Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 8600)      Cluster Addr: 127.0.0.1 (LAN: 8301, WAN: 8302)           Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false==> Log data will now stream in as it occurs:    2017/12/25 15:25:25 [DEBUG] Using random ID "a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3" as node ID    2017/12/25 15:25:25 [INFO] raft: Initial configuration (index=1): [{Suffrage:Voter ID:a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3 Address:127.0.0.1:8300}]
      Cluster Addr: 127.0.0.1 (LAN: 8301, WAN: 8302)
           Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false

==> Log data will now stream in as it occurs:

    2017/12/25 15:25:25 [DEBUG] Using random ID "a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3" as node ID    2017/12/25 15:25:25 [INFO] raft: Initial configuration (index=1): [{Suffrage:Voter ID:a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3 Address:127.0.0.1:8300}]
    2017/12/25 15:25:25 [INFO] raft: Initial configuration (index=1): [{Suffrage:Voter ID:a1ed3e1e-d9b2-579b-bdcc-d6fb13a2b3e3 Address:127.0.0.1:8300}]

集群成员

在另一个终端中运行 consul members ,你能看到Consul集群所有的节点。

/ # consul members
Node          Address         Status  Type    Build  Protocol  DC   Segment
fd383e11f665  127.0.0.1:8301  alive   server  1.0.2  2         dc1  <all>

停止代理

这个比较容易，Ctrl+C就搞定了。