ansible--playbook实现负载均衡
创建缩进文件，指定缩进为2格
[devops@server4 ~]$ vim .vimrc
[devops@server4 ~]$ cat .vimrc
autocmd filetype yaml setlocal ai
[devops@server4 ~]$ pwd
/home/devops
四台主机
172.25.2.104 server4 服务端
172.25.2.105 server5 客户端 httpd
172.25.2.106 server6 客户端 httpd
172.25.2.107 server7 haproxy
Apache的安装
1.设置需要安装的主机
[devops@server4 ansible]$ vim inventory
[devops@server4 ansible]$ cat inventory
[test]
172.25.2.105
[web]
172.25.2.106
[webservers:children]
test
web
2.apache.yml的创建
[devops@server4 ansible]$ mkdir apache
[devops@server4 ansible]$ cd apache/
[devops@server4 apache]$ vim httpd.yml
---
- hosts: all ##针对所有主机
vars:
http_port: 80 ##端口
http_ip: '{
{ ansible_facts["eth0"]["ipv4"]["address"]}}' ##ip的抓取
tasks: ##任务1
- name: install httpd ##安装httpd
yum:
name: httpd
state: present ##当前版本
- name: configure httpd
template: ##jinja模板
src: templates/httpd.conf.j2 ##配置文件所在当前路径
dest: /etc/httpd/conf/httpd.conf ##配置文件安装后的路径
owner: root
group: root
mode: 644
notify: restart httpd ##notify：触发器
- name: test page
copy:
src: files/index.html
dest: /var/www/html/index.html
- name: start httpd
service:
name: "{
{ item }}"
state: started
enabled: true
loop:
- httpd
- firewalld
- name: configure firewalld
firewalld:
service: "{
{ item }}"
permanent: yes
immediate: yes
state: enabled
loop:
- http
- https
handlers: ##触发器触发条件
- name: restart httpd
service:
name: httpd
state: restarted
[devops@server4 apache]$ mkdir files
[devops@server4 apache]$ cd files
[devops@server4 files]$ vim index.html
[devops@server4 files]$ cat index.html
www.westos.org
[devops@server4 files]$ cd ..
[devops@server4 apache]$ mkdir templates ## jinja模板路径，可以将参数放入jinja模板，相应客户端的内容会随着参数的改变而改变
[devops@server4 apache]$ cd templates
[devops@server4 templates]$ ls
httpd.conf.j2
42 Listen {
{ http_ip }}:{
{ http_port }}
[devops@server4 ansible]$ ansible-playbook apache/httpd.yml
roles目录结构
role_name:
files：存放需要同步到异地服务器的源码文件及配置文件；
handlers：当资源发生变化时需要进行的操作，若没有此目录可以不建或为空；
meta：存放说明信息、说明角色依赖等信息，可留空；
tasks：定义各种task，要有main.yml，其他文件include包含调用；
templates：存储由template模块调用的模板文本；
vars：本次安装定义的变量
defaults：要有main.yml的文件，用于设定默认的变量
haproxy搭建
[devops@server4 ansible]$ vim inventory
[devops@server4 ansible]$ cat inventory
[test]
172.25.2.104
[devops@server4 ansible]$ ls
ansible.cfg apache haproxy inventory
[devops@server4 ansible]$ cd haproxy/
[devops@server4 haproxy]$ ls
defaults files handlers meta README.md tasks templates tests vars
[devops@server4 haproxy]$ cd templates/
[devops@server4 templates]$ pwd
/home/devops/ansible/haproxy/templates
[devops@server4 templates]$ ls
haproxy.cfg.j2
[devops@server4 ansible]$ vim haproxy/templates/haproxy.cfg.j2
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
#frontend main *:8080
# acl url_static path_beg -i /static /images /javascript /stylesheets
# acl url_static path_end -i .jpg .gif .png .css .js
#
# use_backend static if url_static
# default_backend app
#
##---------------------------------------------------------------------
## static backend for serving up images, stylesheets and such
##---------------------------------------------------------------------
#backend static
# balance roundrobin
# server static 127.0.0.1:4331 check
#
##---------------------------------------------------------------------
## round robin balancing between the various backends
##---------------------------------------------------------------------
listen http *:80
balance roundrobin
server app1 172.25.2.105:80 check
server app2 172.25.2.106:80 check
[devops@server4 ansible]$ vim haproxy/haproxy.yml
---
- hosts: test
tasks:
- name: install haproxy
yum:
name: haproxy
state: present
- name: configure haproxy
template:
src: haproxy.cfg.j2
dest: /etc/haproxy/haproxy.cfg
owner: root
group: root
mode: 664
notify: restart haproxy
- name: start haproxy
service:
name: haproxy
state: started
enabled: True
handlers:
- name: restart haproxy
service:
name: haproxy
state: restarted
物理机测试：
[kiosk@foundation2 ~]$ curl 172.25.2.107:80
server6 www.westos.org
[kiosk@foundation2 ~]$ curl 172.25.2.107:80
server5 www.westos.org
[kiosk@foundation2 ~]$ curl 172.25.2.107:80
server6 www.westos.org
[kiosk@foundation2 ~]$ curl 172.25.2.107:80
server5 www.westos.org
[kiosk@foundation2 ~]$ curl 172.25.2.107:80
server6 www.westos.org
[kiosk@foundation2 ~]$ curl 172.25.2.107:80
server5 www.westos.org
负载均衡实现