文章目录
环境准备
| 主机 | 主机/ip地址 | 主要安装的软件 |
|---|---|---|
| 服务器 | 192.168.162.5 | Docker-ce、Compose 3、Consul、Consul-template |
| 服务器 | 192.168.162.20 | Docker-ce、registrator |
consul部署 (192.168.162.5)
关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
mkdir /root/consul
cd /root/consul
#将consul.0.9.2_linux_amd64.zip上传到/root/consul
unzip consul_0.9.2_linux_amd64.zip
mv consul /usr/bin
consul agent \
-server \
-bootstrap \
-ui \
-data-dir=/var/lib/consul-data \
-bind=192.168.162.5 \
-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 192.168.162.5:8301 alive server 0.9.2 2 dc1
[root@localhost consul]#consul info | grep leader
leader = true
leader_addr = 192.168.162.5:8300
//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 //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nginx集群
1)、安装Gliderlabs/Registrator Gliderlabs/Registrator
可检查容器运行状态自动注册，还可注销docker容器的服务到服务配置中心。
目前支持Consul、Etcd和SkyDNS2
docker run -d \
--name=registrator \
--net=host \
-v /var/run/docker.sock:/tmp/docker.sock \
--restart=always \
gliderlabs/registrator:latest \
-ip=192.168.162.20 \
consul://192.168.162.20:8500
2.测试服务发现功能是否正常
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:99:80 --name test-03 -h test03 httpd
docker run -itd -p:88:80 --name test-04 -h test04 httpd
3.验证http和nginx服务是否注册到consul
浏览器输入http://192.168.162.20:8500，“单击NODES"，然后单击"consurl-server01" ，会出现5个服务
2）、在consul服务器.上查看服务
curl 127.0.0.1:8500/v1/catalog/services
安装consul-template
Consul-Template是一个守护进程，用于实时查询Consul集群信息，并更新文件系统上任意数量的指定模板，生成配置文件。更新完成以后,可以选择运行shell命令执行更新操作，重新加载Nginx。 Consul-Template可以查询Consul中的服务目录、Key、Key-values等。
这种强大的抽象功能和查询语言模板可以使Consul-Template特别适合动态的创建配置文件。
例如:创建Apache/Nginx Proxy Balancers、Haproxy Backends
准备template nginx模板文件
//在consul服务器上操作
vim /root/consul/nginx.ctmpl
upstream http_backend {
{
{range service "nginx"}}
server {
{.Address}}:{
{.Port}};
{
{end}}
}
server {
listen 83;
server_name localhost 192.168.162.5;
access_log /var/log/nginx/gcc.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;
}
}
编译安装nginx（在consul上操作）
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
配置nginx (在consul上操作)
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
配置并启动 template（在consul上操作）
cd /root
#上传consul-template_0.19.3_linux_amd64.zip包到/root目录下
unzip consul-template_0.19.3_linux_amd64.zip
mv consul-template /usr/bin/
consul-template -consul-addr 192.168.200.40:8500 -template "/root/consul/nginx.ctmpl:/usr/local/nginx/conf/vhost/test.conf:/usr/local/nginx/sbin/nginx -s reload" --log-level=info
//另外打开-个终端查看生成配置文件
[root@localhost vhost]#cat /usr/local/nginx/conf/vhost/test.conf
upstream http_backend {
server 192.168.162.20:83;
server 192.168.162.20:84;
}
server {
listen 83;
server_name localhost 192.168.162.5;
access_log /var/log/nginx/gcc.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;
}
}
增加一个nginx容器节点
#增加一个nginx容器节点，测试服务发现及配置更新功能
//在registrator(192.168.162.20)服务端注册
docker run -itd -p:85:80 --name test-05 -h test05 nginx
//在consul服务器监控装填会有提示自动更新
2021/03/26 05:51:59.624677 [INFO] (child) spawning: /usr/local/nginx/sbin/nginx -s reload
2021/03/26 05:53:09.576538 [INFO] (runner) initiating run
2021/03/26 05:53:09.577487 [INFO] (runner) rendered "/root/consul/nginx.ctmpl" => "/usr/local/nginx/conf/vhost/test.conf"
2021/03/26 05:53:09.577505 [INFO] (runner) executing command "/usr/local/nginx/sbin/nginx -s reload" from "/root/consul/nginx.ctmpl" => "/usr/local/nginx/conf/vhost/test.conf"
2021/03/26 05:53:09.577534 [INFO] (child) spawning: /usr/local/nginx/sbin/nginx -s reload
//查看三台nginx容器日志，请求正常轮询到各个容器节点上
docker logs -f test-01
docker logs -f test-02
docker logs -f test-05
consul多节点配置
//添加一台已有docker环境的服务器192.168.162.30/24加入已有的群集中
consul agent \
-server \
-bootstrap \
-ui \
-data-dir=/var/ib/consul-data \
-bind=192.168.162.30 \
-client=0.0.0.0 \
-node=consul-server02 \
-enable-script-checks=true \
-datacenter=dc1 \
-join 192.168.162.5 &> /var/log/consul.log &
-enable-script-checks=true: 设置检查服务为可用
-datacenter: 数据中心名称
-join: 加入到已有的集群中