通过ansible部署高可用LNAMMKP架构
通过ansible部署高可用LNAMMKP架构主/备模式高可用keepalived+{nginx(proxy)|lvs}
两台主机：httpd+php+Discuz!+phpMyAdmin
一台主机：memcached用来缓存php的session；
一台主机：mysql-server或mariadb-server；
实验规划：
这里我规划用备用模式高可用两台keepalived+nginx(proxy)服务器作为前端代理，两台主机httpd+php+MariaDB+Discuz作为后端真实机，memcached放在第一台director上用来缓存php的session，最后用一台ansible主机实现对所有主机的部署调用。
ansible主机：172.16.1.7
director1(nginx+keepalived+memcached)：172.16.1.10，虚拟ip：172.16.1.100
director2(nginx+keepalived)：172.16.1.5
RS1(Apache+php+MariaDB)：172.16.1.3
RS2(Apache+php+MariaDB)：172.16.1.6
拓扑图如下：
注意：
1.把所有节点的防火墙和SElinux关闭，避免对实验干扰。
2.同步所有节点的时间。
当部署完所有的应用后，生成如下所以的文件和子文件。
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# tree
.
├── ansible.cfg
├── files
│ └── nginx.conf
├── hosts
├── playbooks
│ ├── amp.yml
│ ├── first.retry
│ ├── first.yml
│ ├── ngx.retry
│ └── ngx.yml
├── roles
│ ├── amp
│ │ ├── default
│ │ ├── files
│ │ │ └── db.sh
│ │ ├── handlers
│ │ ├── tasks
│ │ │ └── main.yml
│ │ ├── templates
│ │ └── vars
│ ├── keepalived
│ │ ├── default
│ │ ├── files
│ │ ├── handlers
│ │ │ └── main.yml
│ │ ├── tasks
│ │ │ └── main.yml
│ │ ├── templates
│ │ │ └── keepalived.conf.j2
│ │ └── vars
│ ├── memcached
│ │ ├── default
│ │ ├── files
│ │ │ └── Discuz_X3.2_SC_UTF8.zip
│ │ ├── handlers
│ │ │ └── main.yml
│ │ ├── tasks
│ │ │ └── main.yml
│ │ ├── templates
│ │ │ ├── php.ini.j2
│ │ │ └── sessstore.php.j2
│ │ └── vars
│ ├── memcached1
│ │ ├── default
│ │ ├── files
│ │ ├── handlers
│ │ ├── tasks
│ │ │ └── main.yml
│ │ ├── templates
│ │ └── vars
│ └── nginx
│ ├── default
│ ├── files
│ │ ├── default.conf.j2
│ │ └── ip_forward.sh
│ ├── handlers
│ │ └── main.yml
│ ├── tasks
│ │ └── main.yml
│ ├── templates
│ │ ├── nginx.conf.j2
│ │ └── nginx.repo.j2
│ └── vars
├── zrs.retry
└── zrs.yml
36 directories, 29 files
下面开始部署
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配置ansible主机
1.yum -y install ansible
2.
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vim /etc/ansible/hosts
172.16.1.10STATE=MASTER PRI=100
172.16.1.5STATE=BACKUP PRI=98
172.16.1.3
172.16.1.6
172.16.1.10
172.16.1.3
172.16.1.6
3.建立免秘钥登陆，发给所以主机
ssh-keygen -t rsa -f .ssh/id_rsa -P ''
ssh-copy-id -i .ssh/id_rsa.pub root@172.16.1.10
ssh-copy-id -i .ssh/id_rsa.pub root@172.16.1.5
ssh-copy-id -i .ssh/id_rsa.pub root@172.16.1.3
ssh-copy-id -i .ssh/id_rsa.pub root@172.16.1.6
ansible all -m ping测试连通性
https://s1.51cto.com/oss/201711/14/6bb4ac4811ae5fe63ca0bd7492c87970.png
4.在ansible主机上安装nginx和keepalived和php-fpm，以便ansible过程中需要使用其配置文件
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keepalived配置
1.mkdir /etc/ansible/roles/keepalived/{files,tasks,templates,handlers,vars,default} -pv
2.vim /etc/ansible/roles/keepalived/tasks/main.yml
3.vim /etc/ansible/roles/keepalived/handlers/main.yml
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- name: restart keepalived server
service: name=keepalived state=restarted
4.复制刚才安装的keepalived主配置文件到指定目录,并修改如下
vim /etc/ansible/roles/keepalived/template/keepalived.conf.j2
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! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
vrrp_mcast_group4 224.0.43.100
}
vrrp_script ngx_server {
script "killal -0 nginx"
interval 1
weight -5
}
vrrp_instance VI_1 {
state {{ STATE }}
interface eno16777736
virtual_router_id 43
priority {{ PRI }}
advert_int 1
track_script ngx_server
authentication {
auth_type PASS
auth_pass zrs66zrs
}
virtual_ipaddress {
172.16.1.100/32 brd 172.16.1.100dev eno16777736 label eno16777736:0
}
}
-------------------------------------------------------------------------------------------
nginx的配置：
1.mkdir /etc/ansible/roles/nginx/{files,tasks,templates,handlers,vars,default} -pv
2.vim /etc/ansible/roles/nginx/tasks/main.yml
3.vim /etc/ansible/roles/nginx/templates/nginx.repo.j2
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name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1
复制刚才安装的nginx主配置文件到指定目录,并修改如下
vim /etc/ansible/roles/nginx/templates/nginx.conf.j2
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usernginx;
worker_processes1;
error_log/var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections1024;
}
http {
include /etc/nginx/mime.types;
default_typeapplication/octet-stream;
log_formatmain'$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log/var/log/nginx/access.logmain;
upstream amp {
server 172.16.1.3;
server 172.16.1.6;
}
server {
listen 80;
location / {
proxy_pass http://amp;
proxy_set_header X-Real-IP $remote_addr;
}
}
sendfile on;
#tcp_nopush on;
keepalive_timeout65;
#gzipon;
include /etc/nginx/conf.d/*.conf;
}
4.复制刚才安装的nginx主配置文件到指定目录,并修改如下
vim /etc/ansible/roles/nginx/files/default.conf.j2
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server {
listen 80 default_server;
server_namelocalhost;
include /etc/nginx/default.d/*.conf;
location / {
root /usr/share/nginx/html;
proxy_pass http://amp;
indexindex.html index.htm;
}
error_page404 /404.html;
location = /404.html {
root /usr/share/nginx/html;
}
error_page 500 502 503 504/50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
}
5.创建ip_forward脚本，开启前端代理服务器的核心转发功能
vim /etc/ansible/roles/nginx/files/ip_forward.sh
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#!/bin/bash
#
echo > 1 /proc/sys/net/ipv4/ip_forward
-------------------------------------------------------------------------------------------
amp的配置：
1.mkdir /etc/ansible/roles/amp/{files,tasks,templates,handlers,vars,default} -pv
2.vim /etc/ansible/roles/amp/tasks/main.yml
3.创建testdb数据库，和授权用户访问
vim /etc/ansible/roles/amp/files/db.sh
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#!/bin/bash
#
mysql -u root -e "
create database testdb;
grant all on testdb.* TO 'testuser'@'localhost' IDENTIFIED BY '123456';
FLUSH PRIVILEGES;"
-------------------------------------------------------------------------------------------
memcached配置
memcached缓存服务器为第一台调度器即172.16.1.10服务器，所以单独配置为memcached1
1.mkdir /etc/ansible/roles/memcached1/{files,tasks,templates,handlers,vars,default} -pv
2.vim /etc/ansible/roles/memcached1/tasks/main.yml
后端服务器上的配置
3.mkdir /etc/ansible/roles/memcached/{files,tasks,templates,handlers,vars,default} -pv
4.vim /etc/ansible/roles/memcached/tasks/main.yml
说明：
第二个任务：在本机安装php-fpm即可出现并修改/etc/php.ini该配置文件中的段中的缓存路径为如下，
session.save_handler = memcache
session.save_handler = "tcp://172.16.1.10:11211"
第四个任务：是建立一个缓存测试页面
vim /etc/ansible/roles/memcached/templates/sessstore.php
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<?php
$mem = new Memcache;
$mem->connect("172.16.1.10", 11211)or die("Could not connect");
$version = $mem->getVersion();
echo "Server's version: ".$version."<br/>\n";
$mem->set('hellokey', 'Hello World', 0, 600) or die("Failed to save data at the memcached server");
echo "Store data in the cache (data will expire in 600 seconds)<br/>\n";
$get_result = $mem->get('hellokey');
echo "$get_result is from memcached server.";
?>
第五个任务：将Discuz安装包放置在该目录下，传送到后端主机的指定目录。
第六个任务：解压该压缩包并赋予制定用户的权限
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创建主配置文件，并且调用roles：
vim /etc/ansible/zrs.yml
配置完成
先测试运行一下ansible-playbook --check zrs.yml，因为有的主机已经安装了某些软件，所以测试显示的是changed或者ok或者skipping
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# ansible-playbook --check zrs.yml
PLAY **************************************************************************
TASK *****************************************************************
ok:
ok:
TASK *************************************************
changed:
changed:
TASK **************************************************
changed:
changed:
TASK ***************************************************
changed:
changed:
TASK *********************************************************
changed:
ok:
TASK ***********************************************************
ok:
changed:
TASK **********************************************************
changed:
changed:
TASK ************************************************************
changed:
changed:
TASK *************************************************************
changed:
ok:
TASK **************************************************************
changed:
changed:
RUNNING HANDLER *******************************
changed:
changed:
PLAY *************************************************************************
TASK *****************************************************************
ok:
ok:
TASK *************************
skipping: => (item=[])
skipping: => (item=[])
TASK *************************
ok: => (item=)
changed: => (item=)
TASK **********************************************************
skipping: => (item=httpd)
skipping: => (item=mysqld)
skipping: => (item=httpd)
skipping: => (item=mysqld)
TASK **********************************************************
changed: => (item=httpd)
changed: => (item=httpd)
changed: => (item=mariadb)
changed: => (item=mariadb)
PLAY **********************************************************************
TASK *****************************************************************
ok:
TASK **************************************************
ok:
TASK ****************************************************
changed:
PLAY ***********************************************************************
TASK *****************************************************************
ok:
ok:
TASK ***************************************
ok:
ok:
TASK *******************************************
changed:
changed:
TASK ********************************************************
changed:
changed:
TASK *************************************************
changed:
changed:
TASK ****************************************************
changed:
changed:
TASK **********************************************************
changed:
changed:
PLAY RECAP *****************************************************************************
172.16.1.10 : ok=14 changed=8 unreachable=0 failed=0
172.16.1.3 : ok=10 changed=7 unreachable=0 failed=0
172.16.1.5 : ok=11 changed=10 unreachable=0 failed=0
172.16.1.6 : ok=10 changed=6 unreachable=0 failed=0
测试没问题，查看缓存页面是否成功，显示没问题。
开始运行
ansible-playbook zrs.yml
客户端查看，成功。
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