Cloud native Kubernetes series | The role of init container to initialize the container

   kubernetes 1.3This version introduces init containerthe initialization container feature. It is mainly used to start one or more initialization containers before starting the application container (app container), as a basis for the application container. It will only init containerfunction normally if it app containerruns normally.
   init containerThe initialization container is started before other containers in the Pod. init containerThe main function of the initialization container is to perform some initialization tasks before the main container starts. These tasks can include configuration file preparation, data preprocessing, network setup, etc.

   Use case 1: vm.swappiness=35The app container needs to be run in the kubernetes node:
   currently vm.swappinessthe value of each kubernetes node is the default value 30

[root@k8s-master ~]# sysctl -a | grep vm.swap