离线centOS7使用keepalived+docker+nginx构建高可用

离线centOS 7使用keepalived+docker+nginx构建高可用

环境条件：两台centos7的服务器；

IPnginx端口192.168.6.13680192.168.6.13880

一、下载：

下载keepalived需要的环境包，为以下几种依赖：** gcc-c++ pcre pcre-devel zlib zlib-devel openssl-devel popt-devel initscripts net-tools 如果能连接外网直接使用yum，无法连接外网下载rpm包：http://www.rpmfind.net/linux/rpm2html/search.php，搜索需要的包下载下载keepalived，下载地址：https://www.keepalived.org/download.html，我这里下载的是https://www.keepalived.org/software/keepalived-2.0.6.tar.gz 版本

二、安装keepalived

tar -zxvf keepalived-2.0.6.tar.gz; #解压 cd keepalived-2.0.6; #进入解压目录 ./configure --prefix=/usr/local/keepalived; #编译 make && make install; #安装

安装成功后会有/usr/local/keepalived目录，如果安装过程报错，一般就是少包，看步骤一是否缺少包。

/usr/local/keepalived 目录下结构:

三、将keepalived 安装成系统服务

mkdir /etc/keepalived #创建目录 cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ #拷贝主要文件 cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ ln -s /usr/local/sbin/keepalived /usr/sbin/ systemctl daemon-reload #重新加载 systemctl start keepalived.service #启动 #如果有错误执行下面命令替换下 cd /usr/sbin/ rm -f keepalived cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

常用命令:

systemctl daemon-reload #重新加载 systemctl start keepalived.service #启动 systemctl stop keepalived.service #停止 systemctl enable keepalived.service #开机启动 systemctl disable keepalived.service #取消开机启动 systemctl status keepalived.service #服务状态

四、配置keepalived

cd /etc/keepalived #进入配置目录下 mv keepalived.conf keepalived.conf.backup #备份原来配置 vim keepalived.conf #配置文件如下 vrrp_script chk_nginx { script "/etc/keepalived/nginx_check.sh" interval 2 weight -20 } vrrp_instance VI_1 { state MASTER #指定为master interface ens33 #网卡名 virtual_router_id 121 #路由id需要一致 mcast_src_ip 192.168.6.136 #广播本机ip priority 100 #权重 nopreempt advert_int 1 #检测时间 1s authentication { #认证 auth_type PASS auth_pass 1111 } track_script { chk_nginx } virtual_ipaddress { 192.168.6.100 #虚拟ip，得是统一ip段的 } }

添加心跳检测脚本：

vim nginx_check.sh #以下是脚本内容 #!/bin/bash # 容器名称 containerName=nginx currTime=`date +"%Y-%m-%d %H:%M:%S"` # 查看进程是否存在 exist=`docker inspect --format '{{.State.Running}}' ${containerName}` if [ "${exist}" != "true" ]; then #如果关闭了可以重启我们这里方便测试跳过 # docker restart ${containerName} # 记录 echo "${currTime} 重启docker容器，容器名称：${containerName}" >> /mnt/xvde1/ms_ctynyd/scripts/wbwf_monitor.log fi

五、docker中安装Nginx

服务器连接不了外网的话请参考：https://editor.csdn.net/md/?articleId=107047628

docker pull nginx #下载nginx镜像 docker run -d --name nginx nginx:latest #启动一个镜像 mkdir /usr/share/; #创建nginx页面目录 docker cp nginx:/etc/nginx /etc/ #拷贝出配置文件 docker cp nginx:/usr/share /usr/share #拷贝出基础页面 docker stop nginx;#停止容器 docker rm nginx;#删除容器 #映射端口和数据卷，确保宿主机的80端口没被占用 docker run -it -d --name nginx --restart=always -p 80:80 -v /etc/nginx/:/etc/nginx/ -v /usr/share/nginx:/usr/share/nginx --privileged nginx

修改nginx的默认页面

vi /usr/share/nginx/html/index.html

将Welcome to nginx!修改成Welcome to nginx! Master

六、构建另一个服务器的环境

1，将上面的步骤环境在操作一遍

2，配置keepalived.conf如下： 需要修改的就是mcast_src_ip 、state 、priority 这三个参数

vrrp_script chk_nginx { script "/etc/keepalived/nginx_check.sh" interval 2 weight -20 } vrrp_instance VI_1 { state BACKUP #指定为BACKUP interface ens33 #网卡名 virtual_router_id 121 #路由id需要一致 mcast_src_ip 192.168.6.138 #广播本机ip priority 80 #权重 nopreempt advert_int 1 #检测时间 1s authentication { #认证 auth_type PASS auth_pass 1111 } track_script { chk_nginx } virtual_ipaddress { 192.168.6.100 #虚拟ip，得是统一ip段的 } }

3，修改nginx的默认页面

vi /usr/share/nginx/html/index.html

将Welcome to nginx!修改成Welcome to nginx! Slave

systemctl restart keepalived.service #重启keepalived systemctl status keepalived.service #检测一下日志

如果日志输出一下内容则没问题

七、测试

1.客户端测试： 打开dos窗口->输入：curl 192.168.6.100

2，现在我们把docker容器的nginx停了看一下

docker stop nginx

重开dos窗口：

3，docker重启nginx

docker restart nginx

大功告成，楼主在搭建的时候遇到了很多坑。需要耐心，如果错误了细心看了keepalived的日志解决。