{"id":5443,"date":"2023-02-15T14:23:00","date_gmt":"2023-02-15T08:53:00","guid":{"rendered":"https:\/\/trysiteprice.com\/blog\/?p=5443"},"modified":"2023-02-15T14:23:00","modified_gmt":"2023-02-15T08:53:00","slug":"handling-nginx-failover-with-keepalived","status":"publish","type":"post","link":"https:\/\/trysiteprice.com\/blog\/handling-nginx-failover-with-keepalived\/","title":{"rendered":"Handling nginx Failover With KeepAlived"},"content":{"rendered":"

Keepalived is a free, open-source software package that provides failover and load-balancing services for Linux-based systems. It is commonly used to manage web servers and proxies, including nginx. In this example, we will set up a failover cluster with two nginx servers, one acting as the master and the other as a backup.<\/p>\n

Here are the steps to set up a failover cluster with Keepalived and nginx:<\/p>\n

    \n
  1. Install Keepalived on both servers.\n
    \n
    <\/div>\n
    sudo apt-<\/span>get<\/span> update<\/span>
    \nsudo apt-<\/span>get<\/span> install keepalived
    \n<\/code><\/div>\n<\/div>\n<\/li>\n
  2. Configure Keepalived on both servers. Create a configuration file \/etc\/keepalived\/keepalived.conf<\/code> with the following content:\n
    \n
    <\/div>\n
    vrrp_script chk_nginx {
    \n script \"\/usr\/bin\/pgrep nginx\"<\/span>
    \n interval 2<\/span>
    \n}<\/p>\n

    vrrp_instance VI_1 {
    \n interface<\/span> eth0<\/span>
    \n state MASTER
    \n virtual_router_id 51<\/span>
    \n priority 101<\/span>
    \n advert_int 1<\/span>
    \n authentication {
    \n auth_type PASS
    \n auth_pass MySecretPassword
    \n }
    \n virtual_ipaddress {
    \n 10.0<\/span>.0<\/span>.100<\/span>\/24<\/span>
    \n }
    \n track_script {
    \n chk_nginx
    \n }
    \n}
    \n<\/code><\/div>\n<\/div>\n

    This configuration file defines a VRRP instance with ID 51 and virtual IP address 10.0.0.100, which will be the IP address used to access nginx. The chk_nginx<\/code> script will check whether nginx is running. The priority<\/code> parameter determines which server is the master, with the server with the highest priority being the master.<\/p>\n

    Note that you should replace MySecretPassword<\/code> with a strong password.<\/li>\n

  3. Configure nginx on both servers. In the nginx configuration file \/etc\/nginx\/nginx.conf<\/code>, add the following lines:\n
    \n
    <\/div>\n
    upstream backend {
    \n server 10.0<\/span>.0<\/span>.101<\/span>;
    \n server 10.0<\/span>.0<\/span>.102<\/span> backup;
    \n}<\/p>\n

    server {
    \n listen<\/span> 10.0<\/span>.0<\/span>.100<\/span>:80<\/span>;
    \n server_name myserver.com;<\/p>\n

    location \/ {
    \n proxy_pass http:\/\/<\/span>backend;
    \n proxy_set_header Host $host;
    \n proxy_set_header X-Real-IP $remote_addr;
    \n proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    \n }
    \n}
    \n<\/code><\/div>\n<\/div>\n

    This configuration defines an upstream backend with two servers, one at 10.0.0.101 and one at 10.0.0.102. The backup<\/code> parameter tells nginx that the second server should only be used if the first server is unavailable. The server block defines a server listening on the virtual IP address 10.0.0.100 and proxying requests to the backend servers.<\/li>\n

  4. Restart nginx and Keepalived on both servers.\n
    \n
    <\/div>\n
    sudo systemctl restart nginx
    \nsudo systemctl restart keepalived
    \n<\/code><\/div>\n<\/div>\n<\/li>\n<\/ol>\n

    That’s it! You now have a failover cluster with two nginx servers, one acting as the master and the other as a backup. If the master server fails, the backup server will take over and serve requests. Note that this configuration can be modified to include additional servers, load balancing algorithms, and other options.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Keepalived is a free, open-source software package that provides failover and load-balancing services for Linux-based systems. It is commonly used to manage web servers and proxies, including nginx. In this example, we will set up a failover cluster with two nginx servers, one acting as the master and the other as a backup. Here are … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5443","post","type-post","status-publish","format-standard","hentry","category-best-tutorial"],"yoast_head":"\nHandling nginx Failover With KeepAlived - TrySitePrice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/trysiteprice.com\/blog\/handling-nginx-failover-with-keepalived\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Handling nginx Failover With KeepAlived - TrySitePrice\" \/>\n<meta property=\"og:description\" content=\"Keepalived is a free, open-source software package that provides failover and load-balancing services for Linux-based systems. It is commonly used to manage web servers and proxies, including nginx. In this example, we will set up a failover cluster with two nginx servers, one acting as the master and the other as a backup. Here are ... 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