实验环境
ansible节点
keepalived+nginx节点1 ansible自动安装配置
keepalived+nginx节点2 ansible自动安装配置
httpd节点1
httpd节点2
ansible配置
yum install epel-release yum install ansible
vi /etc/ansible/hosts [nginxsrv] 172.20.128.42 172.20.128.43 [keepalivedsrv] 172.20.128.42 172.20.128.43 #配置免密钥登录连接 [root@localhost .ssh]# ssh-keygen [root@localhost .ssh]# ssh-copy-id 172.20.128.42 [root@localhost .ssh]# ssh-copy-id 172.20.128.43 [root@localhost .ssh]# ansible nginxsrv -m ping #指定使用密码连接测试 -k [root@localhost .ssh]# ansible nginxsrv -m ping -k
编写ansible角色脚本
[root@localhost ~]# ls HAnginx [root@localhost ~]# cd HAnginx/ [root@localhost HAnginx]# ls roles start.yaml [root@localhost HAnginx]# cd roles [root@localhost roles]# ls keepalived nginx [root@localhost roles]# cd nginx [root@localhost nginx]# ls tasks templates vars handlers [root@localhost roles]# cd keepalived/ [root@localhost keepalived]# ls tasks templates vars handlers
keepalived角色配置
vips: - vip1: master: node1 interface: ens33 vip: 172.20.103.88/16 instance: VI_1 routeid: 91 - vip2: master: node2 interface: ens33 vip: 172.20.103.99/16 instance: VI_2 routeid: 92 这个文件中变量由ansible自动传递到模板中,因此可以在template中直接引用
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc root@localhost } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_strict vrrp_iptables vrrp_garp_interval 0 vrrp_gna_interval 0 vrrp_mcast_group4 224.0.103.103 } vrrp_script ngxhealth { script "killall -0 nginx && exit 0 || exit 1" interval 1 weight -10 } vrrp_script checkdown { script "/bin/bash -c '[[ -f /etc/keepalived/down ]]' && exit 1 || exit 0" interval 1 weight -20 } {% for v in vips %} vrrp_instance {{ v["instance"] }} { {% if v["master"] == ansible_nodename %} state MASTER priority 100 {% else %} state BACKUP priority 95 {% endif %} interface {{ v["interface"] }} virtual_router_id {{ v["routeid"] }} advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { {{ v["vip"] }} } track_interface { {{ v["interface"] }} } track_script { ngxhealth checkdown } } {% endfor %}
vi yum.yaml - name: install keepalived yum: name=keepalived vi tmpl.yaml - name: copy keepalived conf template: src=keepalived.conf.j2 dest=/etc/keepalived/keepalived.conf vi start.yaml - name: start keepalived service: name=keepalived state=started enabled=yes vi main.yaml - include: yum.yaml - include: tmpl.yaml - include: start.yaml
nginx角色配置
websrv1: 172.20.128.33 webport1: 80 websrv2: 172.20.128.34 webport2: 80
# For more information on configuration, see: # * Official English Documentation: http://nginx.org/en/docs/ # * Official Russian Documentation: http://nginx.org/ru/docs/ user nginx; worker_processes auto; error_log /var/log/nginx/error.log; pid /run/nginx.pid; # Load dynamic modules. See /usr/share/nginx/README.dynamic. include /usr/share/nginx/modules/*.conf; events { worker_connections 1024; } http { log_format main '$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.log main; sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; include /etc/nginx/mime.types; default_type application/octet-stream; # Load modular configuration files from the /etc/nginx/conf.d directory. # See http://nginx.org/en/docs/ngx_core_module.html#include # for more information. include /etc/nginx/conf.d/*.conf; server { listen 80; listen [::]:80; server_name _; root /usr/share/nginx/html; # Load configuration files for the default server block. include /etc/nginx/default.d/*.conf; location / { } error_page 404 /404.html; location = /40x.html { } error_page 500 502 503 504 /50x.html; location = /50x.html { } } # Settings for a TLS enabled server. # # server { # listen 443 ssl http2 default_server; # listen [::]:443 ssl http2 default_server; # server_name _; # root /usr/share/nginx/html; # # ssl_certificate "/etc/pki/nginx/server.crt"; # ssl_certificate_key "/etc/pki/nginx/private/server.key"; # ssl_session_cache shared:SSL:1m; # ssl_session_timeout 10m; # ssl_ciphers HIGH:!aNULL:!MD5; # ssl_prefer_server_ciphers on; # # # Load configuration files for the default server block. # include /etc/nginx/default.d/*.conf; # # location / { # } # # error_page 404 /404.html; # location = /40x.html { # } # # error_page 500 502 503 504 /50x.html; # location = /50x.html { # } # } }
upstream websrvs { server {{ websrv1 }}:{{ webport1 }}; server {{ websrv2 }}:{{ webport2 }}; } server { listen 80 default_server; server_name www.a.com; root /usr/share/nginx/html; location /{ proxy_pass http://websrvs; } }
vi yum.yaml - name: install nginx yum: name=nginx [root@localhost tasks]# cat templ.yaml - name: copy nginx conf template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf - name: copy www conf template: src=www.conf.j2 dest=/etc/nginx/conf.d/www.conf [root@localhost tasks]# cat start.yaml - name: start nginx service: name=nginx state=started enabled=yes [root@localhost tasks]# cat main.yaml - include: yum.yaml - include: templ.yaml - include: start.yaml
启动执行角色
[root@localhost HAnginx]# ls roles start.yaml [root@localhost HAnginx]# ansible-playbook start.yaml #roles目录下的文件 [root@localhost HAnginx]# cd roles [root@localhost roles]# ls keepalived nginx [root@localhost roles]#
注意点
在模板中 {% if v["master"] == ansible_nodename %} 不能写成 {% if v["master"] == {{ ansible_nodename }} %}
只有需要输出变量的值的时候才能写成 {{ ansible_nodename }} 进行变量比较的时候直接写成 ansible_nodename 即可
可以把所有的变量定义在每个角色目录下的/vars/main.yaml文件中,然后可以直接在j2模板中引用这里面的变量名称,j2根据变量和相关业务动态生成各种配置文件传送到相关主机
[root@localhost HAnginx]# ansible all -m setup | grep hostname
"ansible_hostname": "node2",
"ansible_hostname": "node1",
ansible all -m setup -a "filter=ansible_hostname"
使用default()默认值
当我们定义了变量的值时,采用变量的值,当我们没有定义变量的值时,那么使用默认给定的值
[root@master ansible]# cat roles/temp/templates/test_default.j2
Listen: {{ server_port|default(80) }}