Ngxin作為一個強大的開源軟件是可以先做為高可用集群服務的，這篇博文就介紹一下nginx+Keepalived是如何實現高性能+高可用集群服務的
環境介紹：
硬件： 4臺虛擬服務器
系統：CentOS 7.3
軟件：Keepalived、Apache、Nginx
IP及主機名
Master
主機名：shiyan1
IP地址：172.18.17.31
Backup
主機名：shiyan2
IP地址：172.18.17.32
Httpd1
主機名：shiyan3
IP地址：172.18.17.33
Httpd2
主機名：shiyan4
IP地址：172.18.17.34
四臺服務器初始化配置(四臺服務器相同的配置)
關閉防火墻
[root@shiyan~ ]# systemctl disable firewalld [root@shiyan~ ]# systemctl stop firewalld [root@shiyan~ ]# iptables –F
關閉Selinux
[root@shiyan~ ]# vim /etc/selinux/config SELINUX=disabled #保存重啟系統生效
安裝軟件
Master/Backup
[root@shiyan~ ]# yum install keepalived httpd nginx #(Nginx需要單獨配置EPEL源)
Httpd1/Httpd2
[root@shiyan~ ]# yum install httpd
Httpd1配置
[root@shiyan3 ~ ]# mkdir -p /app/apache/html/ [root@shiyan3 ~ ]# chown -R apache.apache /app/apache/html/ [root@shiyan3 ~ ]# echo "Apache Server 1" > /app/apache/html/index.html [root@shiyan3 ~ ]# vim /etc/httpd/conf/httpd.conf #此處是更改httpd.conf中的內容，并非添加內容 DocumentRoot "/app/apache/html" #更改為自定義的路徑 # # Relax access to content within /var/www. # <Directory "/app/apache"> #更改為自定義的路徑 AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/app/apache/html"> #更改為自定義的路徑. [root@shiyan3 ~ ]# systemctl restart httpd #測試網站是否正常運行 [root@yum ~ ]# curl http://172.18.17.33 Apache Server 1 #測試成功
Httpd2配置
[root@shiyan4 ~ ]# mkdir -p /app/apache/html/ [root@shiyan4 ~ ]# chown -R apache.apache /app/apache/html/ [root@shiyan4 ~ ]# echo "Apache Server 2" > /app/apache/html/index.html [root@shiyan4 ~ ]# vim /etc/httpd/conf/httpd.conf #此處是更改httpd.conf中的內容，并非添加內容 DocumentRoot "/app/apache/html" #更改為自定義的路徑 # # Relax access to content within /var/www. # <Directory "/app/apache"> #更改為自定義的路徑 AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/app/apache/html"> #更改為自定義的路徑. [root@shiyan4 ~ ]# systemctl restart httpd #測試網站是否正常運行 [root@yum ~ ]# curl http://172.18.17.34 Apache Server 2 #測試成功
Master配置
配置Sorry-Server
[root@shiyan1 ~ ]# mkdir -p /app/apache/html/
[root@shiyan1 ~ ]# chown -R apache.apache /app/apache/html/
[root@shiyan1 ~ ]# echo "<h2>Sorry Server 1</h2>" > /app/apache/html/index.html
[root@shiyan1 ~ ]# vim /etc/httpd/conf/httpd.conf
#此處是更改httpd.conf中的內容，并非添加內容
Listen 8080
DocumentRoot "/app/apache/html"
#更改為自定義的路徑
#
# Relax access to content within /var/www.
#
<Directory "/app/apache"> #更改為自定義的路徑
AllowOverride None
# Allow open access:
Require all granted
</Directory>
# Further relax access to the default document root:
<Directory "/app/apache/html"> #更改為自定義的路徑.
[root@shiyan1 ~ ]# systemctl restart http
#測試網站是否正常運行
[root@yum ~ ]# curl http://172.18.17.31:8080
<h2>Sorry Server 1</h2> #測試成功
配置Keepalived
[root@shiyan1 ~ ]# cp /etc/keepalived/keepalived.conf{,.bak} #備份文件
[root@shiyan1 ~ ]# vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root #定義收郵件的用戶
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 172.18.17.31 #定義郵件地址
smtp_connect_timeout 30
router_id node1 #定義節點名稱
}
vrrp_instance VI_1 {
state MASTER #定義節點為主節點模式
interface ens33 #定義使用ens33為VIP網卡
virtual_router_id 51 #定義節點編號
priority 150 #定義優先級
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.17.30 #定義VIP
}
}
~ 配置Nginx服務
[root@shiyan1 ~ ]# vim /etc/nginx/nginx.conf
#添加nginx集群
upstream websrvs {
server 172.18.17.33:80;
server 172.18.17.34:80;
server 127.0.0.1:8080 backup;
}
#server 部分的內容需要全部注釋掉
[root@shiyan1 ~ ]# vim /etc/nginx/conf.d/default.conf
server {
listen 80;
location / {
root html;
proxy_pass http://websrvs;
index index.html index.htm;
}
}
[root@shiyan1 ~ ]# systemctl restart nginx
[root@shiyan1 ~ ]# systemctl restart keepalived
[root@shiyan1 ~ ]# systemctl restart httpdBackup配置
配置Sorry-Server
[root@shiyan2 ~ ]# mkdir -p /app/apache/html/
[root@shiyan2 ~ ]# chown -R apache.apache /app/apache/html/
[root@shiyan2 ~ ]# echo "<h2>Sorry Server 2</h2>" > /app/apache/html/index.html
[root@shiyan2 ~ ]# vim /etc/httpd/conf/httpd.conf
#此處是更改httpd.conf中的內容，并非添加內容
Listen 8080
DocumentRoot "/app/apache/html"
#更改為自定義的路徑
#
# Relax access to content within /var/www.
#
<Directory "/app/apache"> #更改為自定義的路徑
AllowOverride None
# Allow open access:
Require all granted
</Directory>
# Further relax access to the default document root:
<Directory "/app/apache/html"> #更改為自定義的路徑.
[root@shiyan2 ~ ]# systemctl restart http
#測試網站是否正常運行
[root@yum ~ ]# curl http://172.18.17.31:8080
<h2>Sorry Server 2</h2> #測試成功
配置Keepalived
[root@shiyan2 ~ ]# cp /etc/keepalived/keepalived.conf{,.bak} #備份文件
[root@shiyan2 ~ ]# vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root #定義收郵件的用戶
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 172.18.17.31 #定義郵件地址
smtp_connect_timeout 30
router_id node1 #定義節點名稱
}
vrrp_instance VI_1 {
state MASTER #定義節點為主節點模式
interface ens33 #定義使用ens33為VIP網卡
virtual_router_id 51 #定義節點編號
priority 150 #定義優先級
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.18.17.30 #定義VIP
}
}
~ 配置Nginx服務
[root@shiyan2 ~ ]# vim /etc/nginx/nginx.conf
#添加nginx集群
upstream websrvs {
server 172.18.17.33:80;
server 172.18.17.34:80;
server 127.0.0.1:8080 backup;
}
#server 部分的內容需要全部注釋掉
[root@shiyan2 ~ ]# vim /etc/nginx/conf.d/default.conf
server {
listen 80;
location / {
root html;
proxy_pass http://websrvs;
index index.html index.htm;
}
}
[root@shiyan2 ~ ]# systemctl restart keepalived
[root@shiyan2 ~ ]# systemctl restart nginx
[root@shiyan2 ~ ]# systemctl restart httpd測試環境
#默認使用rr算法依次輪詢訪問后端httpd服務器 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 1 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 2 #關閉后端http1服務，這樣只能訪問httpd2的服務 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 2 [root@yum ~ ]# curl http://172.18.17.30 Apache Server 2 #關閉兩臺后端主機的httpd服務，這樣因為沒有后端服務器所以Master的sorry-server提供服務 [root@yum ~ ]# curl http://172.18.17.30 <h2>Sorry Server 1</h2> #關閉Master測試 [root@yum ~ ]# curl http://172.18.17.30 <h2>Sorry Server 2</h2>
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