ansible

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：

f678443a34ae6ce1cb5a54e507f93c03.png

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。

[root@zj07 ansible]# 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

│ │ │ └── keepalived.conf.j2

│ ├── memcached

│ │ │ └── Discuz_X3.2_SC_UTF8.zip

│ │ │ ├── php.ini.j2

│ │ │ └── sessstore.php.j2

│ ├── memcached1

│ └── nginx

│ ├── default

│ ├── files

│ │ ├── default.conf.j2

│ │ └── ip_forward.sh

│ ├── handlers

│ │ └── main.yml

│ ├── tasks

│ ├── templates

│ │ ├── nginx.conf.j2

│ │ └── nginx.repo.j2

│ └── vars

├── zrs.retry

└── zrs.yml

36 directories, 29 files

下面开始部署

配置ansible主机

1.yum -y install ansible

vim /etc/ansible/hosts

[knsrvs]

172.16.1.10 STATE=MASTER PRI=100

172.16.1.5 STATE=BACKUP PRI=98

[websrvs]

172.16.1.3

172.16.1.6

[memcached1]

172.16.1.10

[memcached]

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 [email protected]

ansible all -m ping测试连通性

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

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

0fa610dbe484dbe2dc0a40427869ac05.png

3.vim /etc/ansible/roles/keepalived/handlers/main.yml

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

! Configuration File for keepalived

global_defs {

<a href="mailto:br/">vrrp_script ngx_server { script "killal -0 nginx" interval 1 weight -5 }</a>

<a href="mailto:br/">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 172.16.1.100 dev eno16777736 label eno16777736:0 } }</a>

<a href="mailto:br/">nginx的配置：</a>

<a href="mailto:br/">1.mkdir /etc/ansible/roles/nginx/{files,tasks,templates,handlers,vars,default} -pv</a>

<a href="mailto:br/">2.vim /etc/ansible/roles/nginx/tasks/main.yml</a>

<a href="mailto:br/">3.vim /etc/ansible/roles/nginx/templates/nginx.repo.j2 1 2 3 4 5</a>

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

user nginx;

worker_processes 1;

error_log /var/log/nginx/error.log warn;

pid /var/run/nginx.pid;

events {

worker_connections 1024;

}

http {

include /etc/nginx/mime.types;

default_type application/octet-stream;

server {

listen 80;

location / {

proxy_set_header X-Real-IP $remote_addr;

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

listen 80 default_server;

server_name localhost;

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

#!/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

884f0059f4a33875850140a91ce21ae0.png

3.创建testdb数据库，和授权用户访问

vim /etc/ansible/roles/amp/files/db.sh

#!/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

e529bc1acbdb06003731bdf352777a55.png

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

8f49696cd9782bab1a422bdf5e5648ad.png

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[Session]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

<?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

创建主配置文件，并且调用roles：

vim /etc/ansible/zrs.yml

9444d57861d8c98730c8a3961f39bd62.png

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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[root@zj07 ansible]# ansible-playbook --check zrs.yml

PLAY [knsrvs] **

TASK [Gathering Facts] *****

ok: [172.16.1.10]

ok: [172.16.1.5]

TASK [keepalived : install keepalived] *****

changed: [172.16.1.5]

changed: [172.16.1.10]

TASK [keepalived : install conf file] **

TASK [keepalived : start keepalived] ***

TASK [nginx : copy nginx repo] *****

TASK [nginx : install nginx] ***

TASK [nginx : copy conf file] **

TASK [nginx : reload nginx] ****

TASK [nginx : start nginx] *****

TASK [nginx : ip_forward] **

RUNNING HANDLER [keepalived : restart keepalived server] ***

PLAY [websrvs] *****

ok: [172.16.1.6]

ok: [172.16.1.3]

TASK [amp : install apache-php-mysql some package on CentOS 6] *****

skipping: [172.16.1.3] => (item=[])

skipping: [172.16.1.6] => (item=[])

TASK [amp : install apache-php-mysql some package on CentOS 7] *****

ok: [172.16.1.6] => (item=[u'httpd', u'mariadb-server', u'php-fpm', u'php-mysql'])

changed: [172.16.1.3] => (item=[u'httpd', u'mariadb-server', u'php-fpm', u'php-mysql'])

TASK [amp : start apm server] **

skipping: [172.16.1.3] => (item=httpd)

skipping: [172.16.1.3] => (item=mysqld)

skipping: [172.16.1.6] => (item=httpd)

skipping: [172.16.1.6] => (item=mysqld)

changed: [172.16.1.6] => (item=httpd)

changed: [172.16.1.3] => (item=httpd)

changed: [172.16.1.6] => (item=mariadb)

changed: [172.16.1.3] => (item=mariadb)

PLAY [memcached1] **

TASK [memcached1 : install memcached] **

TASK [memcached1 : start memcached] ****

PLAY [memcached] ***

TASK [memcached : install memcached php session] ***

TASK [memcached : transfer php session conf] ***

changed: [172.16.1.3]

changed: [172.16.1.6]

TASK [memcached : reload httpd] ****

TASK [memcached : copy sessstore file] *****

TASK [memcached : copy discuz file] ****

TASK [memcached : tar discuz] **

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。

0332779093768825b0180fc91000b779.png

开始运行

ansible-playbook zrs.yml

客户端查看，成功。

eb6a49fe3c0a4967f945773e28aaa494.png679116343fb5e1f8246423294d7d714c.png

本文转自Vincent一马 51CTO博客，原文链接：http://blog.51cto.com/mazhenbo/2084371，如需转载请自行联系原作者

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