Container image based on debian-slim with all management tools needed to test in-cluster network, dns and other quick and simple checks.

Tools installed:

• curl
• dnsutils
• iputils-ping
• vim
• traceroute
• iproute2
• wget2
• telnet
• postgresql-client
• mariadb-client
• tcpdump
• whois

When in shell bash prompt will show user@localIP

root@172.17.0.2 $

• myip

Will get you your outside public IP which is usefull when you are not sure if your k8s cluster goes through correct gateway etc.

root@172.17.0.2 $ myip
173.12.4.123

You can just call it without getting into container shell as well:

kubectl run mgmt-pod --rm -i --tty --restart=Never --image zzorica/k8s-mgmt-pod:latest -- myip

• db_alive

Check if your mysql or postgresql db is alive. Need only type of db and its address. It will get you exit code 0 if db is alive (no matter that authentication failed for example) and 1|2 if not.

root@172.17.0.2 $ db_alive mysql -h mariadb; echo $?
/usr/bin/mysqladmin: connect to server at 'mariadb' failed
error: 'Access denied for user 'root'@'10.244.0.33' (using password: NO)'
0

It is quite usefull to use in kubernetes for service DB dependency with initContainers. Your pod|pods won't start until DB is ready:

      initContainers:
        - name: wait-for-db
          image: zzorica/k8s-mgmt-pod:0.4
          command: ["sh", "-c", "while ! db_alive mysql mariadb.namespace; do sleep 2; done"]

To quickly use container and jump into shell:

• docker

docker run -it --rm zzorica/k8s-mgmt-pod:latest

• kubernetes

kubectl run mgmt-pod --rm -i --tty --restart=Never --image zzorica/k8s-mgmt-pod:latest

After you exit the pod/container it will get deleted in both envs.