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--- docker_advanced_k8s_troubleshooting [2020/05/25 07:52] – andonovj
+++ docker_advanced_k8s_troubleshooting [2020/05/25 12:47] (current) – [Not installed NFS Client (NFS Dynamic Provisioning)] andonovj
@@ Line 153: / Line 153: @@
 </Code>
+=====Specific Problems=====
+Let's dwelves into more specific problems:
+====Wrong Api Version====
+If you have a wrong Api version in teh YML file, you will receive the following error:
+<Code:bash|Wrong API Version>
+ubuntu@k8s-master:~/external-storage/nfs/deploy/kubernetes$ kubectl create -f nginx.yml
+error: unable to recognize "nginx.yml": no matches for kind "Deployment" in version "extensions/v1beta1"
+</Code>
+To fix that, find where that image has been moved, most probably for newer versions of Kubernetes is:
+<Code:bash|Correct API Version for nginx>
+ubuntu@k8s-master:~/external-storage/nfs/deploy/kubernetes$ cat nginx.yml
+apiVersion: apps/v1
+</Code>
+Bare in mind that can of course change.
+====Not installed NFS Client (NFS Dynamic Provisioning)====
+In case you have NFS dynamic provisioning and you didn't install NFS client on ALL nodes of the cluster, you will get the following error, when you try to create a POD which is to be placed there.
+<Code:bash|Error with NFS client>
+Mounting command: systemd-run
+Mounting arguments: --description=Kubernetes transient mount for /var/lib/kubelet/pods/64003b39-2316-4254-9e62-cb6d09f3fd6e/volumes/kubernetes.io~nfs/pvc-9a8aa090-7c73-4e64-94eb-dcc7805828dd --scope -- mount -t nfs -o vers=4.1 10.111.172.167:/export/pvc-9a8aa090-7c73-4e64-94eb-dcc7805828dd /var/lib/kubelet/pods/64003b39-2316-4254-9e62-cb6d09f3fd6e/volumes/kubernetes.io~nfs/pvc-9a8aa090-7c73-4e64-94eb-dcc7805828dd
+Output: Running scope as unit run-r94910a4067104f079e9aae302b111ab2.scope.
+mount: wrong fs type, bad option, bad superblock on 10.111.172.167:/export/pvc-9a8aa090-7c73-4e64-94eb-dcc7805828dd,
+       missing codepage or helper program, or other error
+       (for several filesystems (e.g. nfs, cifs) you might
+       need a /sbin/mount.<type> helper program)
+       In some cases useful info is found in syslog - try
+       dmesg | tail or so.
+  Warning  FailedMount  42s  kubelet, node-1  MountVolume.SetUp failed for volume "pvc-9a8aa090-7c73-4e64-94eb-dcc7805828dd" : mount failed: exit status 32
+</Code>
+To fix that, just install the NFS client on all the nodes:
+<Code:bash|Instgall NFS Client on Ubuntu>
+root@node-1:~# apt-get install nfs-common
+Reading package lists... Done
+Building dependency tree
+Reading state information... Done
+The following additional packages will be installed:
+  keyutils libnfsidmap2 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libtirpc1 python python-minimal python2.7 python2.7-minimal rpcbind
+Suggested packages:
+  watchdog python-doc python-tk python2.7-doc binfmt-support
+The following NEW packages will be installed:
+  keyutils libnfsidmap2 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libtirpc1 nfs-common python python-minimal python2.7 python2.7-minimal rpcbind
+upgraded, 12 newly installed, 0 to remove and 40 not upgraded.
+Need to get 4,258 kB of archives.
+After this operation, 18.0 MB of additional disk space will be used.
+Do you want to continue? [Y/n] Y
+</Code>
+<Code:bash|Instgall NFS Client on Centos>
+root@node-1:~# yum install -y nfs-utils
+Reading package lists... Done
+Building dependency tree
+Reading state information... Done
+The following additional packages will be installed:
+  keyutils libnfsidmap2 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libtirpc1 python python-minimal python2.7 python2.7-minimal rpcbind
+Suggested packages:
+  watchdog python-doc python-tk python2.7-doc binfmt-support
+The following NEW packages will be installed:
+  keyutils libnfsidmap2 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libtirpc1 nfs-common python python-minimal python2.7 python2.7-minimal rpcbind
+upgraded, 12 newly installed, 0 to remove and 40 not upgraded.
+Need to get 4,258 kB of archives.
+After this operation, 18.0 MB of additional disk space will be used.
+Do you want to continue? [Y/n] Y
+</Code>