● keepalived.service - LVS and VRRP High Availability Monitor Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled) Active: failed (Result: resources) since Sat 2018-08-04 13:06:35 EDT; 16s ago Process: 3435 ExecStart=/usr/local/keepalived/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Aug 04 13:06:35 localhost.localdomain systemd[1]: Starting LVS and VRRP High Availability Monitor... Aug 04 13:06:35 localhost.localdomain systemd[1]: PID file /var/run/keepalived.pid not readable (yet?) after start. Aug 04 13:06:35 localhost.localdomain systemd[1]: Failed to start LVS and VRRP High Availability Monitor. Aug 04 13:06:35 localhost.localdomain systemd[1]: Unit keepalived.service entered failed state. Aug 04 13:06:35 localhost.localdomain systemd[1]: keepalived.service failed.
搭建keepalived注意事项:
环境
主nginx负载均衡器:192.168.5.129 (通过keepalived配置了VIP:192.168.5.101/0供外使用) 副nginx负载均衡器:192.168.5.130(通过keepalived配置了VIP:192.168.5.101/0供外使用)
1.安装 keepalived-1.4.1
tar xf keepalived-1.3.4.tar.gz
cd keepalived-1.3.4
./configure --prefix=/usr/local/keepalived
make && make install
2.配置keepalived文件
复制/sbin/keepalived到/usr/sbin下
> cp /keepalived/sbin/keepalived /usr/sbin/
keepalived默认会读取/etc/keepalived/keepalived.conf配置文件
> mkdir /etc/keepalived
> cp /keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
复制sysconfig文件到/etc/sysconfig下
> cp /keepalived/etc/sysconfig/keepalived /etc/sysconfig/
复制启动脚本到/etc/init.d下
> cd /keepalived-1.3.4
> cp ./keepalived/etc/init.d/keepalived /etc/init.d/
> chmod 755 /etc/init.d/keepalived
3.配置keepalived.conf启动文件
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
vrrp_strict
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance VI_1 {
state MASTER(BACKUP)
interface ens33 -- 注意网卡名字
virtual_router_id 51
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.5.100
192.168.5.101
}
}
4.启动与验证keepalievd <ip addr list>
service keepalived start
systemctl status keepalived.service
5. 遗留问题:
当服务启动后一段时间就自动关闭了服务;(大约几分钟后)
6. 设置centos7开机自动启动服务
vim /lib/systemd/system/keepalived.service
[Unit]
Description=Keepalived
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
PIDFile=/var/run/keepalived.pid
ExecStart=/usr/local/keepalived/sbin/keepalived -D
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
PrivateTmp=true
[Install]
WantedBy=multi-user.target
1;systemctl daemon-reload 重新加载
2:systemctl enable keepalived.service 设置开机自动启动
3:systemctl disable keepalived.service 取消开机自动启动
4:systemctl start keepalived.service 启动
5:systemctl stop keepalived.service停止
设置nginx开机自启动
vim /lib/systemd/system/keepalived.service
[Unit]
Description=nginx
After=network.target
[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx reload
ExecStop=/usr/local/nginx/sbin/nginx quit
PrivateTmp=true
[Install]
WantedBy=multi-user.target
systemctl enable nginx.service
systemctl start nginx.service 启动nginx
systemctl stop nginx.service 结束nginx
systemctl restart nginx.service 重启nginx
7.配置监听文件
vi /root/check_nginx.sh
#! /bin/bash
if [`ps -C nginx --no-header |wc -l` -eq 0 ]
then
systemctl start nginx.service
sleep 2
if [`ps -C nginx --no-header |wc -l` -eq 0]
then
systemctl stop keepalived.service
fi
fi
chmod +x /root/check_nginx.sh
加入到作业计划
crontab -e
*/1 * * * * /root/check_nginx.sh >>/root/check_nginx.log
追加keepalived.conf文件
vrrp_script check_nginx { ######定义监控nginx的脚本
script "/root/check_nginx.sh"
interval 2 ######监控时间间隔
weight 2 ######负载参数
}
vrrp_instance vrrptest {
track_script {
check_nginx
}
8.知识补充:学习shell编程