nginx+keepalived配置高可用HTTP群集
时间:2015-02-09 22:19 来源:linux.it.net.cn 作者:IT
Nginx不仅是一款优秀的WEB服务器,同时可以根据nginx的反代理可以配置成强大的负载均衡器.这里就介绍如何把nginx配置成负载均衡器,并结合keepalived配置高可用的集群.
一般集群主要架构为:
前端为负载均衡器两个:主/备,两种工作方式,一种是备机待机状态,主机故障时备机接管主机工作实现故障庄毅,在主机故障恢复完成时备机继续仅需待机状态,第二种是主备同时工作,一台宕机另外一台自动接管另一台的工作实现故障转移.
第一种方式可以通过将域名解析到一个虚拟ip(vip)上,主负载均衡器绑定虚拟ip,当主负载均衡器出现故障时,通过keepalived自动将vip绑定到备用负载均衡器上同时arping网关刷新MAC地址.,避免单点故障.
第二种方式主备同时绑定一个vip,把域名通过DNS轮询的方式解析到这两个服务器上,主机出现故障,备机就将主机绑定vip绑定到备机上,同时arping网关刷新MAC地址.实现故障转移.
中间为WEB服务器作为real server,处理请求.
后端为数据库和分布式文件系统.数据库一般为主从两台.分布式文件系统有效解决WEB服务器之间的数据同步.有的还会将图片服务器单独分离出来放在后端.
本文使用环境:
CentOS 5.5 32位
nginx:nginx-1.0.11
keepalived：keepalived-1.1.19.tar.gz
主调度器:192.168.3.1
备调度器:192.168.3.2
real server:192.168.3.4/5/6
本文采用第一种方式来进行vip为:192.168.3.253
一、在主备服务器上部署nginx
1.下载
1
wget http://nginx.org/download/nginx-1.0.11.tar.gz
2.安装
1
yum -y install zlib-devel pcre-devel openssl-devel # 安装依赖
2
tar -zxvf nginx-1.0.11.tar.gz
3
cd nginx-1.0.11
4
./configure --prefix=/usr/local/nginx --with-http_ssl_module --with-http_flv_module --with-http_gzip_static_module
5
make && make install
3.配置
配置主调度器的nginx,编辑nginx.conf
01
vi /usr/local/nginx/conf/nginx.conf
02
03
http {
04
include mime.types;
05
default_type application/octet-stream;
06
07
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
08
# '$status $body_bytes_sent "$http_referer" '
09
# '"$http_user_agent" "$http_x_forwarded_for"';
10
11
#access_log logs/access.log main;
12
13
sendfile on;
14
#tcp_nopush on;
15
16
#keepalive_timeout 0;
17
keepalive_timeout 65;
18
19
#gzip on;
20
21
# 添加一组真实的服务器地址池
22
# 供proxy_pass和fastcgi_pass指令中使用的代理服务器
23
upstream real_server_pool {
24
# 后台如果有动态应用的时候,ip_hash指令可以通过hash算法
25
# 将客户端请求定位到同一台后端服务器上,解决session共享,
26
# 但建议用动态应用做session共享
27
# ip_hash;
28
29
# server用于指定一个后端服务器的名称和参数
30
# weight代表权,重默认为1,权重越高被分配的客户端越多
31
# max_fails 指定时间内对后端请求失败的次数
32
# fail_timeout 达到max_fails指定的失败次数后暂停的时间
33
server 192.168.3.4:80 weight=1 max_fails=2 fail_timeout=30s;
34
# down参数用来标记为离线,不参与负载均衡.在ip_hash下使用
35
# 在此做演示,后面测试会去掉
36
server 192.168.3.5:80 weight=1 max_fails=2 fail_timeout=30s down;
37
# backup仅仅在非backup服务器宕机或繁忙的时候使用
38
# (在此做演示,后面测试会去掉)
39
server 192.168.3.6:80 weight=1 max_fails=2 fail_timeout=30s backup;
40
}
41
server {
42
listen 192.168.3.1:80;
43
server_name localhost;
44
45
#charset koi8-r;
46
47
#access_log logs/host.access.log main;
48
49
location / {
50
#root html;
51
#index index.html index.htm;
52
# 使用upstream设置的一组代理服务器
53
# 如果后端服务器出现502或504等执行错误时,
54
# 将自动将请求转发给负载均衡池中的另一台服务器.
55
proxy_next_upstream http_502 http_504 error timeout invalid_header;
56
proxy_pass http://real_server_pool;
57
proxy_set_header Host $host;
58
proxy_set_header X-Forwarded-For $remote_addr;
59
}
60
}
61
}
(注意:配置文件中注释ip_hash,以为ip_hash这个功能将保证这个客户端请求总是被转发到一台服务器上,所以如果启用了ip_hash指令,将不能再使用weight(权重参数),配置文件中加入为解释ip_hash指令)
配置备用nginx,将监听ip改为备用调度器的ip
01
http {
02
include mime.types;
03
default_type application/octet-stream;
04
05
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
06
# '$status $body_bytes_sent "$http_referer" '
07
# '"$http_user_agent" "$http_x_forwarded_for"';
08
09
#access_log logs/access.log main;
10
11
sendfile on;
12
#tcp_nopush on;
13
14
#keepalive_timeout 0;
15
keepalive_timeout 65;
16
17
#gzip on;
18
19
upstream real_server_pool {
20
#ip_hash;
21
server 192.168.3.4:80 weight=1 max_fails=2 fail_timeout=30s;
22
server 192.168.3.5:80 weight=1 max_fails=2 fail_timeout=30s;
23
server 192.168.3.6:80 weight=1 max_fails=2 fail_timeout=30s;
24
}
25
server {
26
listen 192.168.3.2:80; # 监听ip改为本地ip
27
server_name localhost;
28
29
#charset koi8-r;
30
31
#access_log logs/host.access.log main;
32
33
location / {
34
#root html;
35
#index index.html index.htm;
36
proxy_next_upstream http_502 http_504 error timeout invalid_header;
37
proxy_pass http://real_server_pool;
38
proxy_set_header Host $host;
39
proxy_set_header X-Forwarded-For $remote_addr;
40
}
然后启动主备nginx:
1
/usr/local/nginx/sbin/nginx
二、在主备服务器上部署keepalived
安装
安装依赖:
1
yum -y install kernel-devel # 安装依赖
开启路由转发:
1
vi /etc/sysctl.conf
2
net.ipv4.ip_forward = 1 # 此参数改为1
3
sysctl -p # 使修改生效
首先安装ipvs:
1
ln -s /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux # ipvs需要内核文件,做一个软连接
2
# 下载
3
wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
4
tar -zxvf ipvsadm-1.24.tar.gz
5
cd ipvsadm-1.24
6
make
7
make install
然后安装keepalived
1
# 下载
2
wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
3
tar -zxvf keepalived-1.1.19.tar.gz
4
cd keepalived-1.1.19
5
./configure --prefix=/ \ # 安装在默认位置(配置文件,二进制文件,启动脚本放到默认位置)
6
--mandir=/usr/local/share/man/ \
7
--with-kernel-dir=/usr/src/kernels/2.6.18-194.el5-i686/ # 需要内核的头文件
8
make && make install
配置keepalived
编辑主调度器配置文件/etc/keepalived/keepalived.conf
01
global_defs {
02
notification_email {
03
cold_night@linuxzen.com # 定义通知邮箱,有多个可以换行添加
04
}
05
notification_email_from root@linuxzen.com# 定义发送邮件的邮箱
06
smtp_server www.linuxzen.com # 定义发件服务器
07
smtp_connect_timeout 30 # 定义连接smtp服务器超时时间
08
router_id LVS_DEVEL
09
}
10
11
vrrp_instance VI_1 {
12
state MASTER # 标示主备,备机上改为BACKUP
13
interface eth0 # HA监测的端口
14
virtual_router_id 51 # 主备的virtual_router_id的值必须相同
15
priority 100 # 优先级,通常主要比备稍大
16
advert_int 1 # VRRP Multicast 广播周期秒数
17
authentication { # 定义认证
18
auth_type PASS # 认证方式
19
auth_pass 1111 # 认证口令字
20
}
21
virtual_ipaddress { # 定义vip
22
192.168.3.253 # 多个可换行添加,一行一个
23
}
24
}
25
26
virtual_server 192.168.3.253 80 {
27
delay_loop 6 # 每隔 6 秒查询 realserver 状态
28
lb_algo rr
29
lb_kind NAT
30
nat_mask 255.255.255.0
31
persistence_timeout 50 # 同一IP 的连接50秒内被分配到同一台realserver
32
protocol TCP # 用TCP监测realserver的状态
33
34
real_server 192.168.3.1 80 {
35
weight 3 # 权重
36
TCP_CHECK {
37
connect_timeout 10 # 10秒无响应超时
38
nb_get_retry 3
39
delay_before_retry 3
40
connect_port 80
41
}
42
}
43
44
real_server 192.168.3.2 80 {
45
weight 3
46
TCP_CHECK {
47
connect_timeout 3
48
delay_before_retry 3
49
connect_port 80
50
}
51
}
52
}
配置备用调度器的keepalived,只需要将state MASTER 改为state BACKUP,降低priority 100 的值:
01
global_defs {
02
notification_email {
03
cold_night@linuxzen.com
04
}
05
notification_email_from root@linuxzen.com
06
smtp_server www.linuxzen.com
07
smtp_connect_timeout 30
08
router_id LVS_DEVEL
09
}
10
11
vrrp_instance VI_1 {
12
state BACKUP # 备机上改为BACKUP
13
interface eth0
14
virtual_router_id 51 # 主备的virtual_router_id的值必须相同
15
priority 99 # 备用优先级小于主调度器
16
advert_int 1
17
authentication {
18
auth_type PASS
19
auth_pass 1111
20
}
21
virtual_ipaddress {
22
192.168.3.253
23
}
24
}
25
26
virtual_server 192.168.3.253 80 {
27
delay_loop 6
28
lb_algo rr
29
lb_kind NAT
30
nat_mask 255.255.255.0
31
persistence_timeout 50
32
protocol TCP
33
34
real_server 192.168.3.1 80 {
35
weight 3
36
TCP_CHECK {
37
connect_timeout 10
38
nb_get_retry 3
39
delay_before_retry 3
40
connect_port 80
41
}
42
}
43
44
real_server 192.168.3.2 80 {
45
weight 3
46
TCP_CHECK {
47
connect_timeout 3
48
delay_before_retry 3
49
connect_port 80
50
}
51
}
52
}
主备上启动keepalived:
1
service keepalived start
三、测试—–部署后端服务器
在后端服务器安装nginx,这里仅部署一台然后创建3个基于ip的虚拟主机供测试:
绑定ip:
1
ifconfig eth0:1 192.168.3.4/24
2
ifconfig eth0:2 192.168.3.5/24
3
ifconfig eth0:3 192.168.3.6/24
安装nginx后编辑配置文件,在http块里添加:
01
http {
02
server {
03
listen 192.168.3.4:80;
04
server_name 192.168.3.4;
05
06
location / {
07
root html/s1;
08
index index.html index.htm;
09
}
10
}
11
12
server {
13
listen 192.168.3.5:80;
14
server_name 192.168.3.5;
15
16
location / {
17
root html/s2;
18
index index.html index.htm;
19
}
20
}
21
22
server {
23
listen 192.168.3.6:80;
24
server_name 192.168.3.5;
25
26
location / {
27
root html/s3;
28
index index.html index.htm;
29
}
30
}
31
}
创建虚拟主机根目录,并创建不通的首页文档:
1
cd /usr/local/nginx/html/
2
mkdir s1 s2 s3
3
echo server1 > s1/index.html
4
echo server2 > s2/index.html
5
echo server3 > s3/index.html
启动nginx:
1
/usr/local/nginx/sbin/nginx
打开浏览器访问http://192.168.3.253
刷新会看到显示不同的内容:server1,server2,server3(生产中的服务器应该是一样的)
-
-
现在停掉主调度器的keepalived
1
pkill keepalived
查看备调度器的日志:
1
cat /var/log/messages
2
Feb 10 16:36:27 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
3
Feb 10 16:36:28 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
4
Feb 10 16:36:28 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
5
Feb 10 16:36:28 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.3.253
6
Feb 10 16:36:28 cfhost Keepalived_vrrp: Netlink reflector reports IP 192.168.3.253 added
7
Feb 10 16:36:28 cfhost Keepalived_healthcheckers: Netlink reflector reports IP 192.168.3.253 added
8
Feb 10 16:36:33 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.3.253
现在访问http://192.168.3.253依然可以访问.
大家也看到了备机keepalived只有检测主机的keepalived停止的时候才会切换vip,而不是检测一台real server的某一服务(比如检测80端口的HTTP)切换vip,所以在nginx进程停止的时候,如果服务器没有宕机这时候就无法实现故障转移,所以我们编写一个检测nginx状态的脚本结合keepalived实现故障转移:
01
#!/bin/bash
02
#filename:nsc.sh
03
ps aux ¦ grep nginx ¦ grep -v grep 2> /dev/null 1>&2 # 过滤nginx进程
04
if [[ $? -eq 0 ]] # 如果过滤有nginx进程会返回0则认为nginx存活
05
then
06
sleep 5 # 使脚本进入休眠
07
else
08
# 如果nginx没有存活尝试启动nginx,如果失败则杀死keepalived的进程
09
/usr/local/nginx/sbin/nginx
10
ps aux ¦ grep nginx ¦ grep -v grep 2> /dev/null 1>&2
11
if [[ $? -eq 0 ]]
12
then
13
pkill keepalived
14
fi
15
fi
然后后台运行此脚本:
1
nohup sh nsc.sh &
这样就实现了群集的高可靠和高可用.
(责任编辑：IT)
Nginx不仅是一款优秀的WEB服务器,同时可以根据nginx的反代理可以配置成强大的负载均衡器.这里就介绍如何把nginx配置成负载均衡器,并结合keepalived配置高可用的集群.
前端为负载均衡器两个:主/备,两种工作方式,一种是备机待机状态,主机故障时备机接管主机工作实现故障庄毅,在主机故障恢复完成时备机继续仅需待机状态,第二种是主备同时工作,一台宕机另外一台自动接管另一台的工作实现故障转移.
中间为WEB服务器作为real server,处理请求. 本文采用第一种方式来进行vip为:192.168.3.253 一、在主备服务器上部署nginx1.下载
2.安装
3.配置 配置主调度器的nginx,编辑nginx.conf
(注意:配置文件中注释ip_hash,以为ip_hash这个功能将保证这个客户端请求总是被转发到一台服务器上,所以如果启用了ip_hash指令,将不能再使用weight(权重参数),配置文件中加入为解释ip_hash指令)
然后启动主备nginx:
二、在主备服务器上部署keepalived
|
1 |
yum -y install kernel-devel # 安装依赖 |
开启路由转发:
1 |
vi /etc/sysctl.conf |
2 |
net.ipv4.ip_forward = 1 # 此参数改为1 |
3 |
sysctl -p # 使修改生效 |
首先安装ipvs:
1 |
ln -s /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux # ipvs需要内核文件,做一个软连接 |
2 |
# 下载 |
3 |
wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz |
4 |
tar -zxvf ipvsadm-1.24.tar.gz |
5 |
cd ipvsadm-1.24 |
6 |
make |
7 |
make install |
然后安装keepalived
1 |
# 下载 |
2 |
wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz |
3 |
tar -zxvf keepalived-1.1.19.tar.gz |
4 |
cd keepalived-1.1.19 |
5 |
./configure --prefix=/ \ # 安装在默认位置(配置文件,二进制文件,启动脚本放到默认位置) |
6 |
--mandir=/usr/local/share/man/ \ |
7 |
--with-kernel-dir=/usr/src/kernels/2.6.18-194.el5-i686/ # 需要内核的头文件 |
8 |
make && make install |
配置keepalived
编辑主调度器配置文件/etc/keepalived/keepalived.conf
01 |
global_defs { |
02 |
notification_email { |
03 |
cold_night@linuxzen.com # 定义通知邮箱,有多个可以换行添加 |
04 |
} |
05 |
notification_email_from root@linuxzen.com# 定义发送邮件的邮箱 |
06 |
smtp_server www.linuxzen.com # 定义发件服务器 |
07 |
smtp_connect_timeout 30 # 定义连接smtp服务器超时时间 |
08 |
router_id LVS_DEVEL |
09 |
} |
10 |
11 |
vrrp_instance VI_1 { |
12 |
state MASTER # 标示主备,备机上改为BACKUP |
13 |
interface eth0 # HA监测的端口 |
14 |
virtual_router_id 51 # 主备的virtual_router_id的值必须相同 |
15 |
priority 100 # 优先级,通常主要比备稍大 |
16 |
advert_int 1 # VRRP Multicast 广播周期秒数 |
17 |
authentication { # 定义认证 |
18 |
auth_type PASS # 认证方式 |
19 |
auth_pass 1111 # 认证口令字 |
20 |
} |
21 |
virtual_ipaddress { # 定义vip |
22 |
192.168.3.253 # 多个可换行添加,一行一个 |
23 |
} |
24 |
} |
25 |
26 |
virtual_server 192.168.3.253 80 { |
27 |
delay_loop 6 # 每隔 6 秒查询 realserver 状态 |
28 |
lb_algo rr |
29 |
lb_kind NAT |
30 |
nat_mask 255.255.255.0 |
31 |
persistence_timeout 50 # 同一IP 的连接50秒内被分配到同一台realserver |
32 |
protocol TCP # 用TCP监测realserver的状态 |
33 |
34 |
real_server 192.168.3.1 80 { |
35 |
weight 3 # 权重 |
36 |
TCP_CHECK { |
37 |
connect_timeout 10 # 10秒无响应超时 |
38 |
nb_get_retry 3 |
39 |
delay_before_retry 3 |
40 |
connect_port 80 |
41 |
} |
42 |
} |
43 |
44 |
real_server 192.168.3.2 80 { |
45 |
weight 3 |
46 |
TCP_CHECK { |
47 |
connect_timeout 3 |
48 |
delay_before_retry 3 |
49 |
connect_port 80 |
50 |
} |
51 |
} |
52 |
} |
配置备用调度器的keepalived,只需要将state MASTER 改为state BACKUP,降低priority 100 的值:
01 |
global_defs { |
02 |
notification_email { |
03 |
cold_night@linuxzen.com |
04 |
} |
05 |
notification_email_from root@linuxzen.com |
06 |
smtp_server www.linuxzen.com |
07 |
smtp_connect_timeout 30 |
08 |
router_id LVS_DEVEL |
09 |
} |
10 |
11 |
vrrp_instance VI_1 { |
12 |
state BACKUP # 备机上改为BACKUP |
13 |
interface eth0 |
14 |
virtual_router_id 51 # 主备的virtual_router_id的值必须相同 |
15 |
priority 99 # 备用优先级小于主调度器 |
16 |
advert_int 1 |
17 |
authentication { |
18 |
auth_type PASS |
19 |
auth_pass 1111 |
20 |
} |
21 |
virtual_ipaddress { |
22 |
192.168.3.253 |
23 |
} |
24 |
} |
25 |
26 |
virtual_server 192.168.3.253 80 { |
27 |
delay_loop 6 |
28 |
lb_algo rr |
29 |
lb_kind NAT |
30 |
nat_mask 255.255.255.0 |
31 |
persistence_timeout 50 |
32 |
protocol TCP |
33 |
34 |
real_server 192.168.3.1 80 { |
35 |
weight 3 |
36 |
TCP_CHECK { |
37 |
connect_timeout 10 |
38 |
nb_get_retry 3 |
39 |
delay_before_retry 3 |
40 |
connect_port 80 |
41 |
} |
42 |
} |
43 |
44 |
real_server 192.168.3.2 80 { |
45 |
weight 3 |
46 |
TCP_CHECK { |
47 |
connect_timeout 3 |
48 |
delay_before_retry 3 |
49 |
connect_port 80 |
50 |
} |
51 |
} |
52 |
} |
主备上启动keepalived:
1 |
service keepalived start |
三、测试—–部署后端服务器
在后端服务器安装nginx,这里仅部署一台然后创建3个基于ip的虚拟主机供测试:
绑定ip:
1 |
ifconfig eth0:1 192.168.3.4/24 |
2 |
ifconfig eth0:2 192.168.3.5/24 |
3 |
ifconfig eth0:3 192.168.3.6/24 |
安装nginx后编辑配置文件,在http块里添加:
01 |
http { |
02 |
server { |
03 |
listen 192.168.3.4:80; |
04 |
server_name 192.168.3.4; |
05 |
06 |
location / { |
07 |
root html/s1; |
08 |
index index.html index.htm; |
09 |
} |
10 |
} |
11 |
12 |
server { |
13 |
listen 192.168.3.5:80; |
14 |
server_name 192.168.3.5; |
15 |
16 |
location / { |
17 |
root html/s2; |
18 |
index index.html index.htm; |
19 |
} |
20 |
} |
21 |
22 |
server { |
23 |
listen 192.168.3.6:80; |
24 |
server_name 192.168.3.5; |
25 |
26 |
location / { |
27 |
root html/s3; |
28 |
index index.html index.htm; |
29 |
} |
30 |
} |
31 |
} |
创建虚拟主机根目录,并创建不通的首页文档:
1 |
cd /usr/local/nginx/html/ |
2 |
mkdir s1 s2 s3 |
3 |
echo server1 > s1/index.html |
4 |
echo server2 > s2/index.html |
5 |
echo server3 > s3/index.html |
启动nginx:
1 |
/usr/local/nginx/sbin/nginx |
打开浏览器访问http://192.168.3.253
刷新会看到显示不同的内容:server1,server2,server3(生产中的服务器应该是一样的)
现在停掉主调度器的keepalived
1 |
pkill keepalived |
查看备调度器的日志:
1 |
cat /var/log/messages |
2 |
Feb 10 16:36:27 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE |
3 |
Feb 10 16:36:28 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE |
4 |
Feb 10 16:36:28 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs. |
5 |
Feb 10 16:36:28 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.3.253 |
6 |
Feb 10 16:36:28 cfhost Keepalived_vrrp: Netlink reflector reports IP 192.168.3.253 added |
7 |
Feb 10 16:36:28 cfhost Keepalived_healthcheckers: Netlink reflector reports IP 192.168.3.253 added |
8 |
Feb 10 16:36:33 cfhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.3.253 |
现在访问http://192.168.3.253依然可以访问.
大家也看到了备机keepalived只有检测主机的keepalived停止的时候才会切换vip,而不是检测一台real server的某一服务(比如检测80端口的HTTP)切换vip,所以在nginx进程停止的时候,如果服务器没有宕机这时候就无法实现故障转移,所以我们编写一个检测nginx状态的脚本结合keepalived实现故障转移:
01 |
#!/bin/bash |
02 |
#filename:nsc.sh |
03 |
ps aux ¦ grep nginx ¦ grep -v grep 2> /dev/null 1>&2 # 过滤nginx进程 |
04 |
if [[ $? -eq 0 ]] # 如果过滤有nginx进程会返回0则认为nginx存活 |
05 |
then |
06 |
sleep 5 # 使脚本进入休眠 |
07 |
else |
08 |
# 如果nginx没有存活尝试启动nginx,如果失败则杀死keepalived的进程 |
09 |
/usr/local/nginx/sbin/nginx |
10 |
ps aux ¦ grep nginx ¦ grep -v grep 2> /dev/null 1>&2 |
11 |
if [[ $? -eq 0 ]] |
12 |
then |
13 |
pkill keepalived |
14 |
fi |
15 |
fi |
然后后台运行此脚本:
1 |
nohup sh nsc.sh & |
这样就实现了群集的高可靠和高可用.
(责任编辑：IT)