++rook notes
This commit is contained in:
Nico Schottelius
parent
02608ea8fa
commit
3ce72e805f
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@ -460,6 +460,7 @@ In this particular cluster we have 2 pools:
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The device class "hdd-big" is specific to this cluster as it used to
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contain 2.5" and 3.5" HDDs in different pools.
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### [old] Analysing the ceph cluster configuration
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Taking the view from the old cluster, the following items are
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@ -481,6 +482,77 @@ allows adding and removing resources.
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### Analysing the rook configurations
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Taking the opposite view, we can also checkout a running rook cluster
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and the rook disaster recovery documentation to identify what to
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modify.
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Let's have a look at the secrets first:
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```
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cluster-peer-token-rook-ceph kubernetes.io/rook 2 320d
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default-token-xm9xs kubernetes.io/service-account-token 3 320d
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rook-ceph-admin-keyring kubernetes.io/rook 1 320d
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rook-ceph-admission-controller kubernetes.io/tls 3 29d
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rook-ceph-cmd-reporter-token-5mh88 kubernetes.io/service-account-token 3 320d
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rook-ceph-config kubernetes.io/rook 2 320d
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rook-ceph-crash-collector-keyring kubernetes.io/rook 1 320d
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rook-ceph-mgr-a-keyring kubernetes.io/rook 1 320d
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rook-ceph-mgr-b-keyring kubernetes.io/rook 1 320d
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rook-ceph-mgr-token-ktt2m kubernetes.io/service-account-token 3 320d
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rook-ceph-mon kubernetes.io/rook 4 320d
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rook-ceph-mons-keyring kubernetes.io/rook 1 320d
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rook-ceph-osd-token-8m6lb kubernetes.io/service-account-token 3 320d
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rook-ceph-purge-osd-token-hznnk kubernetes.io/service-account-token 3 320d
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rook-ceph-rgw-token-wlzbc kubernetes.io/service-account-token 3 134d
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rook-ceph-system-token-lxclf kubernetes.io/service-account-token 3 320d
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rook-csi-cephfs-node kubernetes.io/rook 2 320d
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rook-csi-cephfs-plugin-sa-token-hkq2g kubernetes.io/service-account-token 3 320d
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rook-csi-cephfs-provisioner kubernetes.io/rook 2 320d
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rook-csi-cephfs-provisioner-sa-token-tb78d kubernetes.io/service-account-token 3 320d
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rook-csi-rbd-node kubernetes.io/rook 2 320d
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rook-csi-rbd-plugin-sa-token-dhhq6 kubernetes.io/service-account-token 3 320d
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rook-csi-rbd-provisioner kubernetes.io/rook 2 320d
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rook-csi-rbd-provisioner-sa-token-lhr4l kubernetes.io/service-account-token 3 320d
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```
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TBC
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### Creating additional resources after the cluster is bootstrapped
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To let rook know what should be there, we already create the two
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`CephBlockPool` instances that match the existing pools:
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```apiVersion: ceph.rook.io/v1
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kind: CephBlockPool
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metadata:
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name: one
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namespace: rook-ceph
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spec:
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failureDomain: host
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replicated:
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size: 3
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deviceClass: ssd
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```
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And for the hdd based pool:
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```
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apiVersion: ceph.rook.io/v1
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kind: CephBlockPool
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metadata:
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name: hdd
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namespace: rook-ceph
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spec:
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failureDomain: host
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replicated:
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size: 3
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deviceClass: hdd-big
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```
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Saving both of these in ceph-blockpools.yaml and applying it:
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```
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kubectl -n rook-ceph apply -f ceph-blockpools.yaml
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```
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### Configuring ceph after the operator deployment
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@ -526,6 +598,29 @@ changes. Important to note is that we use the ceph image version
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v14.2.21, which is the same version as the native cluster.
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### rook v1.8 is incompatible with ceph nautilus
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After deploying the rook operator, the following error message is
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printed in its logs:
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```
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2022-09-03 15:14:03.543925 E | ceph-cluster-controller: failed to reconcile CephCluster "rook-ceph/rook-ceph". failed to reconcile cluster "rook-ceph": failed to configure local ceph cluster: failed the ceph version check: the version does not meet the minimum version "15.2.0-0 octopus"
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```
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So we need to downgrade to rook v1.7. Using `helm search repo
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rook/rook-ceph --versions` we identify the latest usable version
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should be `v1.7.11`.
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We start the downgrade process using
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```
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helm upgrade --install --namespace rook-ceph --create-namespace --version v1.7.11 rook-ceph rook/rook-ceph
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```
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After downgrading the operator is starting the canary monitors and
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continues to bootstrap the cluster.
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### The ceph-toolbox
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To be able to view the current cluster status, we also deploy the
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@ -552,7 +647,7 @@ spec:
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dnsPolicy: ClusterFirstWithHostNet
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containers:
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- name: rook-ceph-tools
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image: rook/ceph:v1.8.10
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image: rook/ceph:v1.7.11
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command: ["/bin/bash"]
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args: ["-m", "-c", "/usr/local/bin/toolbox.sh"]
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imagePullPolicy: IfNotPresent
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@ -593,6 +688,424 @@ spec:
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tolerationSeconds: 5
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```
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### Checking the deployments
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After the rook-operator finished deploying, the following deployments
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are visible in kubernetes:
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```
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[17:25] blind:~% kubectl -n rook-ceph get deployment
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NAME READY UP-TO-DATE AVAILABLE AGE
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csi-cephfsplugin-provisioner 2/2 2 2 21m
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csi-rbdplugin-provisioner 2/2 2 2 21m
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rook-ceph-crashcollector-server48 1/1 1 1 2m3s
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rook-ceph-crashcollector-server52 1/1 1 1 2m24s
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rook-ceph-crashcollector-server53 1/1 1 1 2m2s
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rook-ceph-crashcollector-server56 1/1 1 1 2m17s
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rook-ceph-crashcollector-server57 1/1 1 1 2m1s
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rook-ceph-mgr-a 1/1 1 1 2m3s
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rook-ceph-mon-a 1/1 1 1 10m
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rook-ceph-mon-b 1/1 1 1 8m3s
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rook-ceph-mon-c 1/1 1 1 5m55s
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rook-ceph-mon-d 1/1 1 1 5m33s
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rook-ceph-mon-e 1/1 1 1 4m32s
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rook-ceph-operator 1/1 1 1 102m
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rook-ceph-tools 1/1 1 1 17m
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```
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Relevant for us are the mgr, mon and operator. To stop the cluster, we
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will shutdown the deployments in the following order:
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* rook-ceph-operator: to prevent deployments to recover
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### Data / configuration comparison
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Logging into a host that is running mon-a, we find the following data
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in it:
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```
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[17:36] server56.place5:/var/lib/rook# find
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.
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./mon-a
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./mon-a/data
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./mon-a/data/keyring
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./mon-a/data/min_mon_release
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./mon-a/data/store.db
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./mon-a/data/store.db/LOCK
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./mon-a/data/store.db/000006.log
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./mon-a/data/store.db/000004.sst
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./mon-a/data/store.db/CURRENT
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./mon-a/data/store.db/MANIFEST-000005
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./mon-a/data/store.db/OPTIONS-000008
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./mon-a/data/store.db/OPTIONS-000005
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./mon-a/data/store.db/IDENTITY
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./mon-a/data/kv_backend
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./rook-ceph
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./rook-ceph/crash
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./rook-ceph/crash/posted
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./rook-ceph/log
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```
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Which is pretty similar to the native nodes:
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```
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[17:37:50] red3.place5:/var/lib/ceph/mon/ceph-red3# find
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.
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./sysvinit
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./keyring
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./min_mon_release
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./kv_backend
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./store.db
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./store.db/1959645.sst
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./store.db/1959800.sst
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./store.db/OPTIONS-3617174
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./store.db/2056973.sst
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./store.db/3617348.sst
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./store.db/OPTIONS-3599785
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./store.db/MANIFEST-3617171
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./store.db/1959695.sst
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./store.db/CURRENT
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./store.db/LOCK
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./store.db/2524598.sst
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./store.db/IDENTITY
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./store.db/1959580.sst
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./store.db/2514570.sst
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./store.db/1959831.sst
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./store.db/3617346.log
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./store.db/2511347.sst
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```
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### Checking how monitors are created on native ceph
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To prepare for the migration we take 1 step back and verify how
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monitors are created in the native cluster. The script used for
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monitoring creation can be found on
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[code.ungleich.ch](https://code.ungleich.ch/ungleich-public/ungleich-tools/src/branch/master/ceph/ceph-mon-create-start)
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and contains the following logic:
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* get "mon." key
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* get the monmap
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* Run ceph-mon --mkfs using the monmap and keyring
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* Start it
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In theory we could re-use these steps on a rook deployed monitor to
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join our existing cluster.
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### Checking the toolbox and monitor pods for migration
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When the ceph-toolbox is deployed, we get a ceph.conf and a keyring in
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/ect/ceph. The keyring is actually the admin keyring and allows us to
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make modifications to the ceph cluster. The ceph.conf points to the
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monitors and does not contain an fsid.
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The ceph-toolbox gets this informatoin via 1 configmap
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("rook-ceph-mon-endpoints") and a secret ("rook-ceph-mon").
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The monitor pods on the other hand have an empty ceph.conf and no
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admin keyring deployed.
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### Try 1: recreating a monitor inside the existing cluster
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Let's try to reuse an existing monitor and join it into the existing
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cluster. For this we will first shut down the rook-operator, to
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prevent it to intefere with our migration. Then
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modify the relevant configmaps and secrets and import the settings
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from the native cluster.
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Lastly we will patch one of the monitor pods, inject the monmap from
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the native cluster and then restart it.
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Let's give it a try. First we shutdown the rook-ceph-operator:
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```
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% kubectl -n rook-ceph scale --replicas=0 deploy/rook-ceph-operator
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deployment.apps/rook-ceph-operator scaled
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```
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Then we patch the mon deployments to not run a monitor, but only
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sleep:
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```
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for mon in a b c d e; do
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kubectl -n rook-ceph patch deployment rook-ceph-mon-${mon} -p \
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'{"spec": {"template": {"spec": {"containers": [{"name": "mon", "command": ["sleep", "infinity"], "args": []}]}}}}';
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kubectl -n rook-ceph patch deployment rook-ceph-mon-$mon --type='json' -p '[{"op":"remove", "path":"/spec/template/spec/containers/0/livenessProbe"}]'
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done
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```
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No the pod is restarted and when we execute into it, we will see that
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no monitor is running in it:
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```
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% kubectl -n rook-ceph exec -ti rook-ceph-mon-a-c9f8f554b-2fkhm -- sh
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Defaulted container "mon" out of: mon, chown-container-data-dir (init), init-mon-fs (init)
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sh-4.2# ps aux
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USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
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root 1 0.0 0.0 4384 664 ? Ss 19:44 0:00 sleep infinity
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root 7 0.0 0.0 11844 2844 pts/0 Ss 19:44 0:00 sh
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root 13 0.0 0.0 51752 3384 pts/0 R+ 19:44 0:00 ps aux
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sh-4.2#
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```
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Now for this pod to work with our existing cluster, we want to import
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the monmap and join the monitor to the native cluster. As with any
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mon, the data is stored below `/var/lib/ceph/mon/ceph-a/`.
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Before importing the monmap, let's have a look at the different rook
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configurations that influence the ceph components
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### Looking at the ConfigMap in detail: rook-ceph-mon-endpoints
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As the name says, it contains the list of monitor endpoints:
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```
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kubectl -n rook-ceph edit configmap rook-ceph-mon-endpoints
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...
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csi-cluster-config-json: '[{"clusterID":"rook-ceph","monitors":["[2a0a:e5c0:0:15::fc2]:6789"...
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data: b=[2a0a:e5c0:0:15::9cd9]:6789,....
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mapping: '{"node":{"a":{"Name":"server56","Hostname":"server56","Address":"2a0a:e5c0::...
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```
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As eventually we want the cluster and csi to use the in-cluster
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monitors, we don't need to modify it right away.
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### Looking at Secrets in detail: rook-ceph-admin-keyring
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The first interesting secret is **rook-ceph-admin-keyring**, which
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contains the admin keyring. The old one of course, so we can edit this
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secret and replace it with the client.admin secret from our native
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cluster.
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We encode the original admin keyring using:
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```
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cat ceph.client.admin.keyring | base64 -w 0; echo ""
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```
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And then we update the secret it:
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```
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kubectl -n rook-ceph edit secret rook-ceph-admin-keyring
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```
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[done]
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### Looking at Secrets in detail: rook-ceph-config
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This secret contains two keys, **mon_host** and
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**mon_initial_members**. The **mon_host** is a list of monitor
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addresses. The **mon_host** only contains the monitor names, a, b, c, d and e.
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The environment variable **ROOK_CEPH_MON_HOST** in the monitor
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deployment is set to to **mon_host** key of that secret, so monitors
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will read from it.
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### Looking at Secrets in detail: rook-ceph-mon
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This secret contains the following interesting keys:
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* ceph-secret: the admin key (just the base64 key no section around
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it) [done]
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* ceph-username: "client.admin"
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* fsid: the ceph cluster fsid
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* mon-secret: The key of the [mon.] section
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It's important to mention to use `echo -n` when inserting
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the keys or fsids.
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[done]
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### Looking at Secrets in detail: rook-ceph-mons-keyring
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Contains the key "keyring" containing the [mon.] and [client.admin]
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sections:
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```
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[mon.]
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key = ...
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[client.admin]
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key = ...
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caps mds = "allow"
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caps mgr = "allow *"
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caps mon = "allow *"
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caps osd = "allow *"
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```
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Using `base64 -w0 < ~/mon-and-client`.
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[done]
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### Importing the monmap
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Getting the current monmap from the native cluster:
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```
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ceph mon getmap -o monmap-20220903
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scp root@old-monitor:monmap-20220903
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```
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Adding it into the mon pod:
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```
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kubectl cp monmap-20220903 rook-ceph/rook-ceph-mon-a-6c46d4694-kxm5h:/tmp
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```
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Moving the old mon db away:
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```
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cd /var/lib/ceph/mon/ceph-a
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mkdir _old
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mv [a-z]* _old/
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```
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Recreating the mon fails, as the volume is mounted directly onto it:
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```
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% ceph-mon -i a --mkfs --monmap /tmp/monmap-20220903 --keyring /tmp/mon-key
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2022-09-03 21:44:48.268 7f1a738f51c0 -1 '/var/lib/ceph/mon/ceph-a' already exists and is not empty: monitor may already exist
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% mount | grep ceph-a
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/dev/sda1 on /var/lib/ceph/mon/ceph-a type ext4 (rw,relatime)
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```
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We can workaround this by creating all monitors on pods with other
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names. So we can create mon b to e on the mon-a pod and mon-a on any
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other pod.
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On rook-ceph-mon-a:
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```
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for mon in b c d e;
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do ceph-mon -i $mon --mkfs --monmap /tmp/monmap-20220903 --keyring /tmp/mon-key;
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done
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```
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On rook-ceph-mon-b:
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```
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mon=a
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ceph-mon -i $mon --mkfs --monmap /tmp/monmap-20220903 --keyring /tmp/mon-key
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```
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Then we export the newly created mon dbs:
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```
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for mon in b c d e;
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do kubectl cp rook-ceph/rook-ceph-mon-a-6c46d4694-kxm5h:/var/lib/ceph/mon/ceph-$mon ceph-$mon;
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done
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```
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```
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for mon in a;
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do kubectl cp rook-ceph/rook-ceph-mon-b-57d888dd9f-w8jkh:/var/lib/ceph/mon/ceph-$mon ceph-$mon;
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done
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```
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And finally we test it by importing the mondb to mon-a:
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```
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kubectl cp ceph-a
|
||||
rook-ceph/rook-ceph-mon-a-6c46d4694-kxm5h:/var/lib/ceph/mon/
|
||||
```
|
||||
|
||||
And the other mons:
|
||||
|
||||
```
|
||||
kubectl cp ceph-b rook-ceph/rook-ceph-mon-b-57d888dd9f-w8jkh:/var/lib/ceph/mon/
|
||||
|
||||
```
|
||||
|
||||
### Re-enabling the rook-operator
|
||||
|
||||
As the deployment
|
||||
|
||||
```
|
||||
kubectl -n rook-ceph scale --replicas=1 deploy/rook-ceph-operator
|
||||
```
|
||||
|
||||
Operator sees them running (with a shell)
|
||||
|
||||
```
|
||||
2022-09-03 22:29:26.725915 I | op-mon: mons running: [d e a b c]
|
||||
|
||||
```
|
||||
|
||||
Triggering recreation:
|
||||
|
||||
```
|
||||
% kubectl -n rook-ceph delete deployment rook-ceph-mon-a
|
||||
deployment.apps "rook-ceph-mon-a" deleted
|
||||
```
|
||||
|
||||
Connected successfully to the cluster:
|
||||
|
||||
```
|
||||
|
||||
services:
|
||||
mon: 6 daemons, quorum red1,red2,red3,server4,server3,a (age 8s)
|
||||
mgr: red3(active, since 8h), standbys: red2, red1, server4
|
||||
osd: 46 osds: 46 up, 46 in
|
||||
|
||||
```
|
||||
|
||||
A bit later:
|
||||
|
||||
```
|
||||
mon: 8 daemons, quorum (age 2w), out of quorum: red1, red2, red3, server4, server3, a, c,
|
||||
d
|
||||
mgr: red3(active, since 8h), standbys: red2, red1, server4
|
||||
osd: 46 osds: 46 up, 46 in
|
||||
|
||||
```
|
||||
|
||||
And a little bit later also the mgr joined the cluster:
|
||||
|
||||
```
|
||||
services:
|
||||
mon: 8 daemons, quorum red2,red3,server4,server3,a,c,d,e (age 46s)
|
||||
mgr: red3(active, since 9h), standbys: red1, server4, a, red2
|
||||
osd: 46 osds: 46 up, 46 in
|
||||
|
||||
```
|
||||
|
||||
And a few minutes later all mons joined successfully:
|
||||
|
||||
```
|
||||
mon: 8 daemons, quorum red3,server4,server3,a,c,d,e,b (age 31s)
|
||||
mgr: red3(active, since 105s), standbys: red1, server4, a, red2
|
||||
osd: 46 osds: 46 up, 46 in
|
||||
|
||||
```
|
||||
|
||||
We also need to ensure the toolbox is being updated/recreated:
|
||||
|
||||
```
|
||||
kubectl -n rook-ceph delete pods rook-ceph-tools-5cf88dd58f-fwwlc
|
||||
```
|
||||
|
||||
### Retiring the old monitors
|
||||
|
||||
|
||||
|
||||
### The actual migration
|
||||
|
||||
At this point we have 2 ceph clusters:
|
||||
|
||||
* A new one in rook
|
||||
* The old/native one
|
||||
|
||||
The next steps are:
|
||||
|
||||
Replace fsid in secrets/rook-ceph-mon with that of the old one.
|
||||
|
||||
|
||||
## Changelog
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue