Docker安装etcd

由 Loen 创建，Carrie 最后一次修改 2016-02-24 etcd 基于 Go 语言实现，因此，用户可以从 项目主页 下载源代码自行编译，也可以下载编译好的二进制文件，甚至直接使用制作好的 Docker 镜像文件来体验。二进制文件方式下载编译好的二进制文件都在 github.com/coreos/etcd/releases 页面，用户可以选择需要的版本，或通过下载工具下载。例如，下面的命令使用 curl 工具下载压缩包，并解压。curl -L https://github.com/coreos/etcd/releases/download/v2.0.0-rc.1/etcd-v2.0.0-rc.1-linux-amd64.tar.gz -o etcd-v2.0.0-rc.1-linux-amd64.tar.gztar xzvf etcd-v2.0.0-rc.1-linux-amd64.tar.gzcd etcd-v2.0.0-rc.1-linux-amd64解压后，可以看到文件包括$ lsetcd etcdctl etcd-migrate README-etcdctl.md README.md其中 etcd 是服务主文件，etcdctl 是提供给用户的命令客户端，etcd-migrate 负责进行迁移。推荐通过下面的命令将三个文件都放到系统可执行目录 /usr/local/bin/ 或 /usr/bin/。$ sudo cp etcd* /usr/local/bin/运行 etcd，将默认组建一个两个节点的集群。数据库服务端默认监听在 2379 和 4001 端口，etcd 实例监听在 2380 和 7001 端口。显示类似如下的信息：$ ./etcd2014/12/31 14:52:09 no data-dir provided, using default data-dir ./default.etcd2014/12/31 14:52:09 etcd: listening for peers on http://localhost:23802014/12/31 14:52:09 etcd: listening for peers on http://localhost:70012014/12/31 14:52:09 etcd: listening for client requests on http://localhost:23792014/12/31 14:52:09 etcd: listening for client requests on http://localhost:40012014/12/31 14:52:09 etcdserver: name = default2014/12/31 14:52:09 etcdserver: data dir = default.etcd2014/12/31 14:52:09 etcdserver: snapshot count = 100002014/12/31 14:52:09 etcdserver: advertise client URLs = http://localhost:2379,http://localhost:40012014/12/31 14:52:09 etcdserver: initial advertise peer URLs = http://localhost:2380,http://localhost:70012014/12/31 14:52:09 etcdserver: initial cluster = default=http://localhost:2380,default=http://localhost:70012014/12/31 14:52:10 etcdserver: start member ce2a822cea30bfca in cluster 7e27652122e8b2ae2014/12/31 14:52:10 raft: ce2a822cea30bfca became follower at term 02014/12/31 14:52:10 raft: newRaft ce2a822cea30bfca [peers: [], term: 0, commit: 0, lastindex: 0, lastterm: 0]2014/12/31 14:52:10 raft: ce2a822cea30bfca became follower at term 12014/12/31 14:52:10 etcdserver: added local member ce2a822cea30bfca [http://localhost:2380 http://localhost:7001] to cluster 7e27652122e8b2ae2014/12/31 14:52:11 raft: ce2a822cea30bfca is starting a new election at term 12014/12/31 14:52:11 raft: ce2a822cea30bfca became candidate at term 22014/12/31 14:52:11 raft: ce2a822cea30bfca received vote from ce2a822cea30bfca at term 22014/12/31 14:52:11 raft: ce2a822cea30bfca became leader at term 22014/12/31 14:52:11 raft.node: ce2a822cea30bfca elected leader ce2a822cea30bfca at term 22014/12/31 14:52:11 etcdserver: published {Name:default ClientURLs:[http://localhost:2379 http://localhost:4001]} to cluster 7e27652122e8b2ae此时，可以使用 etcdctl 命令进行测试，设置和获取键值 testkey: "hello world"，检查 etcd 服务是否启动成功：$ ./etcdctl set testkey "hello world"hello world$ ./etcdctl get testkeyhello world说明 etcd 服务已经成功启动了。当然，也可以通过 HTTP 访问本地 2379 或 4001 端口的方式来进行操作，例如查看 testkey 的值：$ curl -L http://localhost:4001/v2/keys/testkey{"action":"get","node":{"key":"/testkey","value":"hello world","modifiedIndex":3,"createdIndex":3}}Docker 镜像方式下载镜像名称为 quay.io/coreos/etcd:v2.0.0_rc.1，可以通过下面的命令启动 etcd 服务监听到 4001 端口。$ sudo docker run -p 4001:4001 -v /etc/ssl/certs/:/etc/ssl/certs/ quay.io/coreos/etcd:v2.0.0_rc.1