Thursday, December 8, 2016

Simple Shortcuts for Docker and K8s Ops

If you frequently work with the Docker/Kubernetes (or OpenShift) stack, you may find the following shortcut commands handy:

# aliases for kubectl commands

# for operations on kube-system namespace, e.g. kubesys get pods == kubectl get pods --namespace=kube-system
alias kubesys='kubectl --namespace=kube-system'

# resource getters
alias pods='kubectl get pods'
alias logs='kubectl logs'
alias get='kubectl get'
alias desc='kubectl describe'
alias svc='kubectl get svc'
alias rc='kubectl get rc'
alias rs='kubectl get rs'
alias dep='kubectl get deployment'
alias nodes='kubectl get nodes'

# edit/delete ops
alias del='kubectl delete'
alias deldep='kubectl delete deployment'
alias editdep='kubectl edit deployment'
alias edit='kubectl edit'

# open a shell to a running pod
alias kssh='kubectl exec -it'


# aliases for Docker control/management commands

# list Docker images
alias dimg='docker images'

# clean dangling images (https://github.com/docker/docker/issues/8926)
alias dclean='docker rmi -f `docker images -f "dangling=true" -q`'

# start a new container with a shell, and discard it after exit from the shell
alias drun='docker run --rm -it --entrypoint=sh'


# service control for an all-in-one K8s node (master + minion on same machine)

# starting the full stack
alias kreboot='for i in etcd flanneld docker kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet; do sudo service $i restart; service $i status; done'

# stopping the full stack
alias kdown='for i in etcd flanneld docker kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet; do sudo service $i stop; done'

# checking status of all required services (any unavailability will be displayed in red)
alias kstat='for i in etcd flanneld docker kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet; do service $i status | grep -B2 "Active:" | grep -v "Loaded:" | grep -E "inactive|exited|$"; done'

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