Docker Consul容器服务更新与发现

[ ~]# mkdir consul
[ ~]# cp /opt/consul_0.9.2_linux_amd64.zip /root/consul/
[ ~]# cd /root/consul/
[ consul]# unzip consul_0.9.2_linux_amd64.zip
[ consul]# ls
consul  consul_0.9.2_linux_amd64.zip
[ consul]# mv consul /usr/bin/
[ consul]# consul agent \    //使用代理功能
-server \       //提供server功能
-bootstrap \    //参与选举为领袖
-ui \           //提供web访问界面
-data-dir=/var/lib/consul-data \        //参数存储位置
-bind=192.168.7.129 \       //绑定地址
-client=0.0.0.0 \           //面对所有节点终端
-node=consul-server01 &> /var/log/consul.log &  //指定本地节点名称，指定日志文件目录，放在后台运行

2.查看集群信息

[ consul]# consul members
Node             Address             Status  Type    Build  Protocol  DC
consul-server01  192.168.7.129:8301  alive   server  0.9.2  2         dc1
[ consul]# consul info | grep leader
leader = true
leader_addr = 192.168.7.129:8300

3.通过httpd api获取集群信息

[ ~]# curl 127.0.0.1:8500/v1/status/peers    //查看集群server成员
[ ~]# curl 127.0.0.1:8500/v1/status/leader   //查看领导者信息
[ ~]# curl 127.0.0.1:8500/v1/catalog/services    //注册的所有服务
[ ~]# curl 127.0.0.1:8500/v1/catalog/nginx   //查看nginx服务信息
[ ~]# curl 127.0.0.1:8500/v1/catalog/nodes   //集群节点详细信息

二、容器服务自动添加到nginx集群
1.安装Gliderlabs/Registrator

[ ~]# docker run -d --name=registrator \    //指定名称
--net=host \            //指定网络
-v /var/run/docker.sock:/tmp/docker.sock \    //指定数据卷
--restart=always \      //restart功能
gliderlabs/registrator:latest -ip=192.168.7.168 \     //指定本地IP地址
consul://192.168.7.129:8500

2.添加nginx服务

[ ~]# docker run -itd -p:83:80 --name test-01 -h test01 nginx
[ ~]# docker run -itd -p:84:80 --name test-02 -h test02 nginx
[ ~]# docker ps -a
CONTAINER ID        IMAGE                           COMMAND                  CREATED             STATUS              PORTS                NAMES
960d01d212c4        nginx                           "nginx -g ‘daemon of…"   4 seconds ago       Up 3 seconds        0.0.0.0:84->80/tcp   test-02
bc075c1c3670        nginx                           "nginx -g ‘daemon of…"   59 seconds ago      Up 57 seconds       0.0.0.0:83->80/tcp   test-01
5dd120cd1232        gliderlabs/registrator:latest   "/bin/registrator -i…"   3 minutes ago       Up 3 minutes                             registrator

3.验证nginx服务是否注册到consul


在consul服务器上查看服务

[ consul]# curl 127.0.0.1:8500/v1/catalog/services
{"consul":[],"nginx":[]}

4.准备template nginx模板文件

[ ~]# vim /root/consul/nginx.ctmpl
upstream http_backend {
{{range service "nginx"}}
server {{.Address}}:{{.Port}};
{{end}}
}
server {
listen 83;
server_name localhost 192.168.7.129;
access_log /var/log/nginx/kgc.cn-access.log;
index index.html index.php;
location / {
proxy_set_header HOST $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Client-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://http_backend;
 }
}

5.编译安装并配置nginx

[ ~]# yum install gcc pcre-devel zlib-devel -y
[ ~]# tar zxvf nginx-1.12.0.tar.gz -C /opt
[ ~]# cd /opt/nginx-1.12.0
[ ~]# ./configure --prefix=/usr/local/nginx
[ ~]# make && make install
[ ~]# vim /usr/local/nginx/conf/nginx.conf
http {
  include       mime.types;
  include       vhost/*.conf;   //添加虚拟主机目录
  default_type  application/octet-stream;
#创建虚拟主机目录
[ ~]# mkdir /usr/local/nginx/conf/vhost
#创建日志文件目录
[ ~]# mkdir /var/log/nginx
#启动nginx
/usr/local/nginx/sbin/nginx

6.配置并启动template
上传consul-template_0.19.3_linux_amd64.zip到/root/consul目录下

[ consul]# unzip consul-template_0.19.3_linux_amd64.zip
[ consul]# mv consul-template /usr/bin
[ consul]# consul-template -consul-addr 192.168.7.129:8500 -template "/root/consul/nginx.ctmpl:/usr/local/nginx/conf/vhost/aaa.conf:/usr/local/nginx/sbin/nginx -s reload" --log-level=info
#启动后，会在vhost目录下自动生成aaa.conf配置文件
[ ~]# ls /usr/local/nginx/conf/vhost/
abc.conf

7.增加一个nginx容器节点，测试服务发现及配置更新功能（在registrator服务端增加

[ ~]# docker run -itd -p:85:80 --name test-03 -h test03 nginx`

consul服务器监控会有提示自动更新