Notes

How do you access the etcd that is being used by the OpenShift started by oc cluster up or using minishift. If you are using minishift then get docker environment access of the minishift VM by running following commands. eval $(minishift docker-env) && eval $(minishift oc-env) Exec into the container named origin that runs OpenShift and all the needed services. $ docker exec -it origin bash First install the etcdctl needed to talk to etcd. [root@surajd origin]$ yum -y install etcd Get into the directory where all the certs and keys are available. ...

There is no easy way to change namespace in Kubernetes using kubectl command line utility. But here are some commands that you can alias in your bashrc file so that it’s just a single command that you can use to change the namespace in the Kubernetes cluster. Change namespace Let’s see step by step what goes in to change the namespace. So the first step is to find the context. A context element in a kubeconfig file is used to group access parameters under a convenient name. Each context has three parameters: cluster, namespace, and user. By default, the kubectl command-line tool uses parameters from the current context to communicate with the cluster. Read more. ...

This post is very specific to OpenShift and how you can have an application exposing prometheus metrics to be scraped by a prometheus running in the same cluster. Requirements Setting up cluster I have done it using the oc cluster up, read about how to do this here. You could also setup a local OpenShift cluster by running minishift, read about setting up minishift here. Downloading Kedge The configurations defined for setting up this cluster is written in a format that is understood by a tool called Kedge. This makes configuration easier to understand and edit. So for using this setup download Kedge and put it in your path as explained here. ...

This post has shortcuts that are generic and golang specific as well. This post will edited from time to time. Shortcuts Toggle side bar Ctrl + B Project explorer in side bar Ctrl + Shift + E Project wide search in side bar Ctrl + Shift + F Source control in side bar Ctrl + Shift + G Copy entire line Ctrl + C (without any selection) Delete entire line Ctrl + Shift + K ...

Make sure you have npm installed. $ sudo dnf -y install npm Package npm-1:3.10.10-1.6.10.3.1.fc25.x86_64 is already installed, skipping. Dependencies resolved. Nothing to do. Complete! Taken from this post. mkdir "${HOME}/.npm-packages" echo 'prefix=${HOME}/.npm-packages' | tee -a ~/.npmrc echo ' #====================================== # npm related stuff NPM_PACKAGES="${HOME}/.npm-packages" PATH="$NPM_PACKAGES/bin:$PATH" # Unset manpath so we can inherit from /etc/manpath via the `manpath` command unset MANPATH # delete if you already modified MANPATH elsewhere in your config export MANPATH="$NPM_PACKAGES/share/man:$(manpath)" #====================================== ' | tee -a ~/.bashrc Ref: npm throws error without sudo - Stack Overflow question Install npm packages globally without sudo on macOS and Linux

Here is a single node Kubernetes on CRI-O. This setup is done on Fedora 25. Installing OS dependencies dnf -y install \ go \ git \ btrfs-progs-devel \ device-mapper-devel \ glib2-devel \ glibc-devel \ glibc-static \ gpgme-devel \ libassuan-devel \ libgpg-error-devel \ libseccomp-devel \ libselinux-devel \ pkgconfig \ wget \ etcd \ iptables Creating go environment cd ~ mkdir -p ~/go export GOPATH=~/go export GOBIN=$GOPATH/bin export PATH=$PATH:$GOBIN echo 'GOPATH=~/go' >> ~/.bashrc echo 'GOBIN=$GOPATH/bin' >> ~/.bashrc echo 'PATH=$PATH:$GOBIN' >> ~/.bashrc Pull all the code dependencies go get -d k8s.io/kubernetes go get -u github.com/cloudflare/cfssl/cmd/... Install runc go get -d github.com/opencontainers/runc cd $GOPATH/src/github.com/opencontainers/runc git reset --hard v1.0.0-rc3 make BUILDTAGS='seccomp selinux' && make install Build cri-o cd go get -d github.com/kubernetes-incubator/cri-o cd $GOPATH/src/github.com/kubernetes-incubator/cri-o make install.tools make && make install make install.config Set up CNI go get -d github.com/containernetworking/cni cd $GOPATH/src/github.com/containernetworking/cni ./build.sh mkdir -p /opt/cni/bin cp bin/* /opt/cni/bin/ mkdir -p /etc/cni/net.d/ cat > /etc/cni/net.d/10-ocid-bridge.conf <<EOF { "cniVersion": "0.2.0", "name": "ocid-bridge", "type": "bridge", "bridge": "cni0", "isGateway": true, "ipMasq": true, "ipam": { "type": "host-local", "subnet": "10.88.0.0/16", "routes": [ { "dst": "0.0.0.0/0" } ] } } EOF cat > /etc/cni/net.d/99-loopback.conf <<EOF { "cniVersion": "0.2.0", "type": "loopback" } EOF Create policy.json mkdir -p /etc/containers cat > /etc/containers/policy.json <<EOF { "default": [ { "type": "insecureAcceptAnything" } ] } EOF Make SELinux happy mkdir -p /var/lib/containers/ chcon -Rt svirt_sandbox_file_t /var/lib/containers/ Start ocid service export PATH=$PATH:/usr/local/bin/ echo 'PATH=$PATH:/usr/local/bin/' >> ~/.bashrc ocid --runtime /usr/local/sbin/runc --log /root/ocid.log --debug --selinux true Start k8s cluster with crio cd $GOPATH/src/k8s.io/kubernetes/ CONTAINER_RUNTIME=remote CONTAINER_RUNTIME_ENDPOINT='/var/run/ocid.sock --runtime-request-timeout=15m' ./hack/local-up-cluster.sh To use kubectl (in new terminal) ...

Notes about using git. Tips and tricks Switch branches $ git checkout <branch> status $ git status -sb Show status in short format and also give branch info show $ git show Shows log message and diff about the commit you are on. log $ git log -L 70,100:pkg/transformer/kubernetes/kubernetes.go Get logs on file between line numbers. $ git log --graph --abbrev-commit Show graph in logs. commit $ git add -p Commit only parts of file. Interactively choose chunks of patch. ...

Note: This is a living document and will be updated as I discover new things. Shortcuts Ctrl + Shift + A Find any action in IDE Ctrl + Shift + F Find in Path Alt + 1 Open project navigator. You can search here, just start typing here, after the project navigator window is opened. Shift + Insert in Project window Here you can add new file to the project. The filename could be the entire path, so the intermediate directories will be created for you. ...