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In my IBM Cloud Private, I see several pause containers.
Can anyone explain the purpose of these? Normally, I can get to the bash shell in a running container but not the ones which are pause.
# docker ps | grep pause ee5f3f6b9fc0 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_catalog-catalog-apiserver-8qxrf_kube-system_3b4b107d-0b72-11e8-9f22-005056227136_0 d238dad0c5b8 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_auth-apikeys-bk28g_kube-system_3b731880-0b72-11e8-9f22-005056227136_0 0196efb043ca ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_icp-router-htnhz_kube-system_3b8d25d3-0b72-11e8-9f22-005056227136_0 b09dc1759d09 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_unified-router-bskb6_kube-system_3af9d44e-0b72-11e8-9f22-005056227136_0 8a392f174c24 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_auth-pap-gfh7q_kube-system_3aa5b311-0b72-11e8-9f22-005056227136_0 0ac776eb9ced ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_platform-api-zr5pz_kube-system_3b2ce527-0b72-11e8-9f22-005056227136_0 107896ebfcd6 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_icp-ds-0_kube-system_3a9200f8-0b72-11e8-9f22-005056227136_0 f95df5fbcc4a ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_image-manager-0_kube-system_3ae74f5c-0b72-11e8-9f22-005056227136_0 a9d30804f222 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_auth-idp-h4fmt_kube-system_3ad78a99-0b72-11e8-9f22-005056227136_0 eaae55900637 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_catalog-ui-jv9sq_kube-system_3af5cb32-0b72-11e8-9f22-005056227136_0 4ace18a84d8b ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_auth-pdp-9vhzx_kube-system_3ae0a074-0b72-11e8-9f22-005056227136_0 98b70f6074c7 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_calico-policy-controller-5997c6c956-cx774_kube-system_39bfecef-0b72-11e8-9f22-005056227136_0 63a0340e3de8 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_rescheduler-jqtd4_kube-system_3a6d4b05-0b72-11e8-9f22-005056227136_0 cace008e71b1 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_kube-dns-9494dc977-7gwpx_kube-system_39a15b6b-0b72-11e8-9f22-005056227136_0 80a18b538ef3 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_platform-ui-k5g7h_kube-system_3a98aad3-0b72-11e8-9f22-005056227136_0 bea43bfc8d70 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_catalog-catalog-controller-manager-bd9f49c8c-4fqcp_kube-system_39653745-0b72-11e8-9f22-005056227136_0 f54f329e50ae ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_helm-api-5d8b6d6f9c-4rl2s_kube-system_396ade8d-0b72-11e8-9f22-005056227136_0 6812e3fee9cc ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_tiller-deploy-55fb4d8dcc-pcxbj_kube-system_396b0005-0b72-11e8-9f22-005056227136_0 69a840bc394b ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_helmrepo-5878d9d858-wlcrj_kube-system_396506a5-0b72-11e8-9f22-005056227136_0 03bc9ce0413d ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_heapster-5fd94775d5-28t6w_kube-system_396b0dd6-0b72-11e8-9f22-005056227136_0 8763167695b3 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_filebeat-ds-amd64-q54pc_kube-system_9b8515d6-0b52-11e8-99a8-005056227136_1 461e5de11ee1 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_calico-node-amd64-ql292_kube-system_53492619-0b51-11e8-99a8-005056227136_1 f73e2eb9dbaf ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_k8s-master-192.168.142.103_kube-system_c39080358687c72432da5f6de4b6fff9_1 c08f029af60e ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_k8s-mariadb-192.168.142.103_kube-system_6b640df7dae2cb064ebc450b273ce62a_1 0174b5c35963 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_k8s-proxy-192.168.142.103_kube-system_b9f441de4995384d245d71fdb65e2cc2_1 f6befd10c479 ibmcom/pause:3.0 "/pause" About an hour ago Up About an hour k8s_POD_k8s-etcd-192.168.142.103_kube-system_a5150d8f6ee1f8047b05f9b2d5cbcaba_1 
751
The docker pause command suspends all processes in the specified containers. On Linux, this uses the freezer cgroup. Traditionally, when suspending a process the SIGSTOP signal is used, which is observable by the process being suspended.
Every Kubernetes Pod includes an empty pause container, which bootstraps the Pod to establish all of the cgroups, reservations, and namespaces before its individual containers are created. The pause container image is always present, so the pod resource allocation happens instantaneously as containers are created.
Pause Container If we want to pause the processes running inside the container, we can use the “docker pause” command. To unpause the container, use “docker unpause” command.
No, it is not possible to remove a paused container. Before it can be removed the container needs to be in the stopped state. This guide of best Docker questions and answers was presented to you by considering all the essentials regarding the same.
The 'pause' container is a container which holds the network namespace for the pod. Kubernetes creates pause containers to acquire the respective pod’s IP address and set up the network namespace for all other containers that join that pod.
You can access below links for details.
https://groups.google.com/forum/#!topic/kubernetes-users/jVjv0QK4b_o
https://www.ianlewis.org/en/almighty-pause-container
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Pause is a secret container that runs on every pod in Kubernetes. This container’s primary job is to keep the namespace open in case all the other containers on the pod die.
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