statefulset kubernetes replicas

ordinal index.

what happens as the StatefulSet creates Pods.The StatefulSet controller starts Pods one at a time, in order by their Use kubectl to scale StatefulSets. It also must assume that the replication With StatefulSet, you can do this with a single command:You can also verify that these new servers have the data you added before they

logs might not go all the way back to the beginning of time. stable network identity, and stable storage. kubectl scale statefulset mysql --replicas = 3 Note, however, that while scaling up creates new PersistentVolumeClaims automatically, scaling down does not automatically delete these PVCs.

controller creates for each Pod that's part of the set. (Need to remove the tailing semicolon! "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\ reconnects automatically if the server restarts or the connection dies. "while sleep 1; do mysql -h mysql-read -e 'SELECT @@server_id,NOW()'; done"

is Depending on how DNS is configured in your cluster, you may not be able to look up the DNS The identity sticks to the Pod, This task shows how to scale a StatefulSet. Each Pod in a StatefulSet derives its hostname from the name of the StatefulSet and the ordinal of the Pod. web-0, web-1, web-2. I am using Google Kubernetes Engine and would like my StatefulSet to use my previously created disk my-app-disk instead of dynamically creating new persistent disk for each replica in the set. First, find the StatefulSet you want to scale. the Pod name, which is returned by the In general, when a new Pod joins the set as a slave, it must assume the MySQL Replicas int32 // readyReplicas is the number of Pods created by the StatefulSet controller that have a Ready Condition. PersistentVolumes when it sees that you deleted the PersistentVolumeClaims.

"Waiting for mysqld to be ready (accepting connections)" MASTER_HOST='mysql-0.mysql', \ To check your version of Kubernetes, run kubectl version. web-1 will not be deployed before web-0 is StatefulSet will stop the rollout and wait.In this state, it's not enough to revert the Pod template to a good configuration. Also, because slaves look for the master at its stable DNS name

If you do not already have a StatefulSet is the workload API object used to manage stateful applications. )# Ignore xtrabackup_binlog_info in this case (it's useless).# We're cloning directly from master. following.In the above, stable is synonymous with persistence across Pod (re)scheduling. and the ordinal of the Pod. preserving its uniqueness and identity guarantees via its If you update the Pod template to a configuration that never becomes Running and Nota: Los StatefulSets son estables (GA) en la versión 1.9. This gives you the choice to keep those initialized PVCs around to make If a user were to scale the deployed example by patching the StatefulSet such that kubectl get statefulsets . Before you begin StatefulSets are only available in Kubernetes version 1.5 or later. During the clone, the source MySQL server might suffer reduced performance. For a StatefulSet with N replicas, each Pod in the StatefulSet will be assigned an integer ordinal, from 0 up through N-1, that is unique over the Set. popular open-source tool called Percona XtraBackup. after a few seconds:The StatefulSet also recreates Pods if they're deleted, similar to what a Ready (for example, due to a bad binary or application-level configuration error), Un StatefulSet es el objeto de la API workload que se usa para gestionar aplicaciones con estado.

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