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how to restart container instead of deleting pod and recreate? – Apache

There are cases when you want to restart a specific container instead of deleting the pod and letting Kubernetes recreate it.

i am having one pod running apache container. i did editing in apache config file. for SSL certificate virtual host port changes etc.

now i want to restart apache2 service but without recreating pod.

i tried inside pod with 

service apache2 restart

but it also recreate pod and configuration also change again.

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2

Answers


  1. 0

    check this

    You can also create a new dockerfile for override the apache dockerfile and change de CMD line, but it’s more complicated

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  2. 0

    This is not how it supposed to work.

    You should not change anything inside the POD.
    If your POD dies or crushes, Kubernetes should just start a new one and everything should work.
    Also keep in mind that you cannot scale the POD that had configuration altered.

    Please check the Kubernetes docs Configure a Pod to Use a ConfigMap

    You can use ConfigMap to create configuration file.

    ConfigMaps allow you to decouple configuration artifacts from image content to keep containerized applications portable. This page provides a series of usage examples demonstrating how to create ConfigMaps and configure Pods using data stored in ConfigMaps.

    ConfigMap can be created and read a content of a file :

    $ kubectl create configmap config_data --from-file=config_data.txt

    or it can be declared in .yml

    config_map:
  data: 
    db_name=colors_db
    table_name=purple
  name: config_data
  version: v1

    Also this might be done by creating a secret
    or secret can be declared:

    secret:
  data:
    username: my-username
    password: my-password
  name: secret_data
  version: v1

    I recommend reading Kubernetes recipe: store nginx config with ConfigMap and reverse-proxy requests from your domain to your Github page.

    There are also other options like mounting path with needed configuration on new POD.
    I advice you to check Configure a Pod to Use a PersistentVolume for Storage

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