docker--consul部署服务发现、自动更新
部署环境
两台centos7，IP地址和所需环境如下
192.168.218.142 docker-ce docker-compose3 consul consul-template
192.168.218.148 docker-ce registor
下面开始部署consul
[root@localhost ~]# mkdir /root/consul
[root@localhost ~]# cd consul/
[root@localhost consul]# ls
consul_0.9.2_linux_amd64.zip consul-template_0.19.3_linux_amd64.zip
[root@localhost consul]# unzip consul_0.9.2_linux_amd64.zip
[root@localhost consul]# mv consul /usr/bin/
[root@localhost consul]# consul agent \
> -server \
> -bootstrap \
> -ui \
> -data-dir=/var/lib/consul-data \
> -bind=192.168.218.142 \
> -client=0.0.0.0 \
> -node=consul-server01 &> /var/log/consul.log &
查看集群信息
[root@localhost consul]# consul members
Node Address Status Type Build Protocol DC
consul-server01 192.168.218.142:8301 alive server 0.9.2 2 dc1
[root@localhost consul]# consul info |grep leader
leader = true
leader_addr = 192.168.218.142:8300
通过httpdapi获取集群信息，注意consul默认端口为8500
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 # 集群Raf leader
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
容器服务自动加入consul集群
在需要加入的主机192.168.218.148上操作
安装registor
[root@localhost ~]# docker run -d \
> --name=registrator \
> --net=host \
> -v /var/run/docker.sock:/tmp/docker.sock \
> --restart=always \
> gliderlabs/registrator:latest \
> -ip=192.168.218.148 \
> consul://192.168.218.142:8500
创建容器，测试发现服务是否正常
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 run -itd -p:88:80 --name test-03 -h test03 httpd
docker run -itd -p:89:80 --name test-04 -h test04 httpd
回到consul服务器上
[root@localhost consul]# curl 127.0.0.1:8500/v1/catalog/services
{"consul":[],"httpd":[],"nginx":[]}
通过浏览器访问http://192.168.218.142:8500，查看服务
如图
到此，consul已部署完成，可以服务发现，下面部署consul-template，完成自动更新
在consul服务器上安装 consul-template
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 1216;
server_name localhost 192.168.218.142;
access_log /var/log/nginx/nginx-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;
}
}
模板文件是一个nginx的配置文件，用于对刚刚配置的nginx服务做负载（也可以对httpd服务做负载），下面编译安装nginx，可参照我的博客
编译安装LNMP
配置nginx
vim /usr/local/nginx/conf/nginx.conf
http {
include
mime types;
include vhost/*.conf; //添加虚拟主机日录
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
配置并启动template
unzip consul-template_0.19.3_linux_amd64.zip
mv consul-template /usr/bin/
启用模板
[root@localhost consul]# consul-template -consul-addr=192.168.218.142:8500 -template="/root/consul/nginx.ctmpl:/usr/local/nginx/conf/vhost/consul.conf:/usr/local/nginx/sbin/nginx -s reload" --log-level=info
启动consul-template后会输出信息：
2020/04/22 06:32:59.632332 [INFO] (runner) creating watcher
2020/04/22 06:32:59.632545 [INFO] (runner) starting
2020/04/22 06:32:59.632551 [INFO] (runner) initiating run
2020/04/22 06:32:59.633849 [INFO] (runner) initiating run
新建一个终端，查看ctmpl模板文件生成的nginx配置文件
[root@localhost ~]# vim /usr/local/nginx/conf/vhost/consul.conf
upstream http_backend {
server 192.168.218.148:83;
server 192.168.218.148:84;
}
server {
listen 1216;
server_name localhost 192.168.218.142;
access_log /var/log/nginx/nginx-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;
}
}
下面尝试自动发现
在192.168.218.148上新加一个nginx容器
[root@localhost consul]# docker run -d -p 85:80 --name test-05 -h test
05 nginx
这时consul进程会有提示信息，如下：
2020/04/22 06:54:01.331571 [INFO] (runner) initiating run
2020/04/22 06:54:01.332554 [INFO] (runner) rendered "/root/consul/nginx.ctmpl" => "/usr/local/nginx/conf/vhost/consul.conf"
2020/04/22 06:54:01.332577 [INFO] (runner) executing command "/usr/local/nginx/sbin/nginx -s reload" from "/root/consul/nginx.ctmpl" => "/usr/local/nginx/conf/vhost/consul.conf"
2020/04/22 06:54:01.332743 [INFO] (child) spawning: /usr/local/nginx/sbin/nginx -s reload
再次查看consul服务器上刚刚生成的nginx配置文件
[root@localhost ~]# vim /usr/local/nginx/conf/vhost/consul.conf
upstream http_backend {
server 192.168.218.148:83;
server 192.168.218.148:84;
server 192.168.218.148:85;
}
server {
listen 1216;
server_name localhost 192.168.218.142;
access_log /var/log/nginx/nginx-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;
}
}
已经增加了新的nginx容器
使用浏览器访问http://192.168.218.142:8500，也可以查看到新增加的容器
使用curl命令访问nginx，注意监听的端口
curl 192.168.218.142:1216
多用几次curl访问nginx，产生一些访问日志，然后再到192.168.218.148上，查看nginx容器的日志
[root@localhost consul]# docker logs -f test-01
192.168.218.142 - - [22/Apr/2020:06:51:27 +0000] "GET / HTTP/1.0" 200612 "-" "curl/7.29.0" "192.168.218.142"
^C
[root@localhost consul]# docker logs -f test-02
192.168.218.142 - - [22/Apr/2020:06:51:38 +0000] "GET / HTTP/1.0" 200612 "-" "curl/7.29.0" "192.168.218.142"
^C
[root@localhost consul]# docker logs -f test-05
192.168.218.142 - - [22/Apr/2020:06:51:52 +0000] "GET / HTTP/1.0" 200612 "-" "curl/7.29.0" "192.168.218.142"
^C
到此，consul-template自动发现已部署完成