本篇内容主要讲解“CentOS7源码安装和部署keepalived-2.1.5”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“CentOS7源码安装和部署keepalived-2.1.5”吧!
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一、基础环境
| 系统版本 | nginx版本 | keepalived版本 | ip | 作用 | | CentOS Linux release 7.6 | nginx/1.18.0 | keepalived-2.1.5 | 192.168.86.135 | master |
| CentOS Linux release 7.6 | nginx/1.18.0 | keepalived-2.1.5 | 192.168.86.136 | slave |
VIP:192.168.86.137
二、编译环境安装
yum -y install make zlib zlib-devel gcc-c++ libtool openssl openssl-devel pcre pcre-devel
三、安裝nginx
安裝nignx
#进入目录
cd /tools #上传安装文件，并解压
tar -zxvf nginx-1.18.0.tar.gz
#进入安装目录
cd nginx-1.18.0
#检查配置
./configure --prefix=/usr/local/nginx
make&&make install
#查看nginx版本
/usr/local/nginx/sbin/nginx -v
#配置nginx（检查）/usr/local/nginx/sbin/nginx -t
#nginx管理命令
/usr/local/nginx/sbin/nginx # 启动
/usr/local/nginx/sbin/nginx -s stop # 停止
/usr/local/nginx/sbin/nginx -s reload # 重新载入配置文件
修改nginx配置文件
修改 Nginx 欢迎首页内容（用于后面测试， 用于区分两个节点的 Nginx）：
master
echo 'this is master 135' > /usr/share/nginx/html/index.html
slave
echo 'this is slave 136' > /usr/share/nginx/html/index.html
修改nginx.conf
# vi /usr/local/nginx/conf/nginx.con
user root;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 88;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root html;
index index.html index.htm;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}
启动nginx
systemctl start nginx
测试nginx启动
curl localhost
this is master
四、安装keepalived
1、 创建依赖环境
yum -y install libnl libnl-devel gcc openssl-devel libnl3-devel pcre-devel net-snmp-agent-libs libnfnetlink-devel curl
mkdir /etc/keepalived
wget https://www.keepalived.org/software/keepalived-2.1.5.tar.gz
2、安装keepalived
tar -zxvf keepalived-2.1.5.tar.gz
cd keepalived-2.0.15
./configure --prefix=/usr/local/keepalived-2.1.5
make && make install
3、创建启动文件
ln -s /usr/local/keepalived-2.1.5 /usr/local/keepalived
mkdir /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived-2.1.5/etc/sysconfig/keepalived /etc/sysconfig/
n -s /usr/local/keepalived-2.1.5/sbin/keepalived /usr/sbin/
下面文件要从keepalived源码目录复制，安装目录中没有cp
cp /tools/keepalived-2.1.5/keepalived/keepalived.service /etc/systemd/system/
cp /tools/keepalived-2.1.5/keepalived/etc/init.d/keepalived /etc/init.d/
4、创建配置文件
master
cat > /etc/keepalived/keepalived.conf << EOF
# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
## keepalived 自带的邮件提醒需要开启 sendmail 服务。 建议用独立的监控或第三方 SMTP
router_id server1 ## 标识本节点的字条串，通常为 hostname
}
## keepalived 会定时执行脚本并对脚本执行的结果进行分析，动态调整 vrrp_instance 的优先级。如果脚本执行结果为 0，并且 weight 配置的值大于 0，则优先级相应的增加。如果脚本执行结果非 0，并且 weight配置的值小于 0，则优先级相应的减少。其他情况，维持原本配置的优先级，即配置文件中 priority 对应的值。
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh" ## 检测 nginx 状态的脚本路径
interval 2 ## 检测时间间隔
weight -20 ## 如果条件成立，权重-20
}
## 定义虚拟路由， VI_1 为虚拟路由的标示符，自己定义名称
vrrp_instance VI_1 {
state MASTER ## 主节点为 MASTER， 对应的备份节点为 BACKUP
interface ens33 ## 绑定虚拟 IP 的网络接口，与本机 IP 地址所在的网络接口相同， 我的是 eth0
virtual_router_id 33 ## 虚拟路由的 ID 号， 两个节点设置必须一样， 可选 IP 最后一段使用, 相同的 VRID 为一个组，他将决定多播的 MAC 地址
mcast_src_ip 192.168.86.135 ## 本机 IP 地址
priority 100 ## 节点优先级， 值范围 0-254， MASTER 要比 BACKUP 高
nopreempt ## 优先级高的设置 nopreempt 解决异常恢复后再次抢占的问题
advert_int 1 ## 组播信息发送间隔，两个节点设置必须一样， 默认 1s
## 设置验证信息，两个节点必须一致
authentication {
auth_type PASS
auth_pass 123456 ## 真实生产，按需求对应该过来
}
## 将 track_script 块加入 instance 配置块
track_script {
chk_nginx ## 执行 Nginx 监控的服务
} #
# 虚拟 IP 池, 两个节点设置必须一样
virtual_ipaddress {
192.168.86.137 ## 虚拟 ip，可以定义多个
}
}
EOFslave
cat > /etc/keepalived/keepalived.conf << EOF
# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id server2
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 2
weight -20
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 33
mcast_src_ip 192.168.86.136
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
track_script {
chk_nginx
}
virtual_ipaddress {
192.168.86.137
}
}
EOF
5、启编写Nginx 状态检测脚本
编写 Nginx 状态检测脚本 /etc/keepalived/nginx_check.sh (已在 keepalived.conf 中配置)脚本要求：如果 nginx 停止运行，
尝试启动，如果无法启动则杀死本机的 keepalived 进程， keepalied将虚拟 ip 绑定到 BACKUP 机器上。 内容如下：
cat > /etc/keepalived/nginx_check.sh << EOF
# vi /etc/keepalived/nginx_check.sh
#!/bin/bash
A=`ps -C nginx –no-header |wc -l`
if [ $A -eq 0 ];then
/usr/local/nginx/sbin/nginx
sleep 2
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
killall keepalived
fi
fi
EOF
保存后，给脚本赋执行权限：
# chmod +x /etc/keepalived/nginx_check.sh
6、启动keepalived
systemctl start keepalived
systemctl enable keepalived
五、测试
1、在两台服务器上测试
master
$ curl localhost
this is master
root@centos7[14:46:07]:~
$ curl 192.168.86.135
this is master
root@centos7[15:03:29]:~
slave
$ curl localhost
this is slave
root@centos7[15:03:59]:/etc/keepalived
$ curl 192.168.86.136
this is master
2、关闭master的keepalived模仿down机
master关闭keepalived
$ systemctl stop keepalived
在slave上面进行测试
$ curl localhost
this is slave
root@centos7[15:10:29]:/etc/keepalived
$ curl 192.168.86.136
this is slave
到此keepalived完成
到此，相信大家对“CentOS7源码安装和部署keepalived-2.1.5”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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