Merge pull request #41944 from jingxu97/Feb/mounter

Automatic merge from submit-queue (batch tested with PRs 35094, 42095, 42059, 42143, 41944)

Use chroot for containerized mounts

This PR is to modify the containerized mounter script to use chroot
instead of rkt fly. This will avoid the problem of possible large number
of mounts caused by rkt containers if they are not cleaned up.

test/e2e_node/jenkins/gci-init.yaml

@@ -3,10 +3,15 @@
 runcmd:
   - mount /tmp /tmp -o remount,exec,suid
   - usermod -a -G docker jenkins
-  - mkdir -p /home/kubernetes/bin/
-  - mount -B /home/kubernetes/bin /home/kubernetes/bin
-  - mount -B -o remount,exec /home/kubernetes/bin 
-  - wget https://storage.googleapis.com/kubernetes-release/rkt/v1.18.0/rkt -O /home/kubernetes/bin/rkt
-  - wget https://storage.googleapis.com/kubernetes-release/rkt/v1.18.0/stage1-fly.aci -O /home/kubernetes/bin/stage1-fly.aci
-  - wget https://storage.googleapis.com/kubernetes-release/gci-mounter/gci-mounter-v2.aci -O /home/kubernetes/bin/gci-mounter-v2.aci
-  - chmod a+x /home/kubernetes/bin/rkt
+  - mkdir -p /var/lib/kubelet
+  - mkdir -p /home/kubernetes/containerized_mounter/rootfs
+  - mount --bind /home/kubernetes/containerized_mounter/ /home/kubernetes/containerized_mounter/
+  - mount -o remount, exec /home/kubernetes/containerized_mounter/
+  - wget https://storage.googleapis.com/kubernetes-release/gci-mounter/mounter.tar -O /tmp/mounter.tar
+  - tar xvf /tmp/mounter.tar -C /home/kubernetes/containerized_mounter/rootfs
+  - mkdir -p /home/kubernetes/containerized_mounter/rootfs/var/lib/kubelet
+  - mount --rbind /var/lib/kubelet /home/kubernetes/containerized_mounter/rootfs/var/lib/kubelet
+  - mount --make-rshared /home/kubernetes/containerized_mounter/rootfs/var/lib/kubelet
+  - mount --bind /proc /home/kubernetes/containerized_mounter/rootfs/proc
+  - mount --bind /dev /home/kubernetes/containerized_mounter/rootfs/dev
+  - rm /tmp/mounter.tar