{"id":251,"date":"2025-04-06T10:53:23","date_gmt":"2025-04-06T08:53:23","guid":{"rendered":"https:\/\/www.24x7serverguard.com\/blog\/?p=251"},"modified":"2025-04-06T10:57:13","modified_gmt":"2025-04-06T08:57:13","slug":"if-youre-deploying-a-multi-container-app-via-cpanel-and-your-api-image-is-running-fine-but-it-needs-to-connect-to","status":"publish","type":"post","link":"https:\/\/www.24x7serverguard.com\/blog\/cpanel\/if-youre-deploying-a-multi-container-app-via-cpanel-and-your-api-image-is-running-fine-but-it-needs-to-connect-to\/","title":{"rendered":"If you’re deploying a multi-container app via cPanel, and your API image is running fine, but it needs to connect to:"},"content":{"rendered":"\n
    \n
  1. The Redis<\/strong> container (for caching or sessions),<\/li>\n\n\n\n
  2. The Database<\/strong> container (e.g., MySQL\/PostgreSQL\/etc.)<\/li>\n<\/ol>\n\n\n\n

    To enable communication between your containers, especially when using cPanel<\/strong> (which might be using Docker<\/strong> or Podman<\/strong> under the hood), you need to make sure they are:<\/p>\n\n\n\n

      \n
    • On the same Docker network<\/strong><\/li>\n\n\n\n
    • Using the container name as hostname<\/strong> when calling each other<\/li>\n<\/ul>\n\n\n\n

      \u2705 Steps to ensure API can reach Redis and Database:<\/h3>\n\n\n\n

      1. Use a custom bridge network<\/strong><\/h4>\n\n\n\n

      This ensures containers can talk to each other by name.<\/p>\n\n\n\n

      docker network create app-network<\/mark><\/p>\n\n\n\n

      2. Run your containers on that network<\/strong><\/h4>\n\n\n\n
      # Redis
      docker run -d --name redis --network app-network redis

      # Database (example: PostgreSQL)
      docker run -d --name db --network app-network -e POSTGRES_PASSWORD=secret postgres

      # API
      docker run -d --name api --network app-network your-api-image<\/mark>

      3. Update your API configuration
      For Redis:
      REDIS_HOST=redis
      REDIS_PORT=6379<\/mark>

      For Database:
      DB_HOST=db
      DB_PORT=5432  # or 3306 for MySQL<\/mark>

      Make sure your API code uses environment variables (or hardcoded names) like redis and db as hostnames.

      \ud83d\udee0 If you're using cPanel's GUI:
      If you're not using SSH but managing containers through cPanel's Docker Manager or Application Manager, look for:

      A way to assign the same network name to all containers.

      Define environment variables for REDIS_HOST and DB_HOST.
      <\/pre>\n","protected":false},"excerpt":{"rendered":"
      To enable communication between your containers, especially when using cPanel (which might be using Docker or Podman under the hood), you need to make sure they are: \u2705 Steps to ensure API can reach Redis and Database: 1. Use a custom bridge network This ensures containers can talk to each other by name. docker network […]<\/p>\n","protected":false},"author":1,"featured_media":253,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[197,199,202,198,200,201,203],"class_list":["post-251","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cpanel","tag-api","tag-api-image-is-running-fine","tag-docker-network","tag-multi-container-app-via-cpanel","tag-mysql","tag-postgresql","tag-redis-host"],"_links":{"self":[{"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/posts\/251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/comments?post=251"}],"version-history":[{"count":1,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/posts\/251\/revisions"}],"predecessor-version":[{"id":252,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/posts\/251\/revisions\/252"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/media\/253"}],"wp:attachment":[{"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/media?parent=251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/categories?post=251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.24x7serverguard.com\/blog\/wp-json\/wp\/v2\/tags?post=251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}