How do I...
SSH to master node
Navigate to the cloned repository directory <SETUP_HOME> and run the following command:
vagrant ssh master
SSH to minion-1 node
Navigate to the cloned repository directory <SETUP_HOME> and run the following command:
vagrant ssh minion-1
SSH to minion-2 node
Navigate to the cloned repository directory <SETUP_HOME> and run the following command:
vagrant ssh minion-2
List all the machines in CoreOS cluster
ssh to the master node
fleetctl list-machines
The following is a sample of the output that will appear:
core@master ~ $ fleetctl list-machines MACHINE IP METADATA 07215782... 172.17.8.100 - 4b56425a... 172.17.8.102 - bf39a4c4... 172.17.8.101 -
List the available replication controllers
ssh to master node
kubectl list /replicationControllers
The following is a sample of the output that will appear:
core@master ~ $ kubectl list /replicationControllers ID Image(s) Selector Replicas test2.php.domain 54.254.64.141:5000/stratos-php name=php 2
List the available pods
ssh to master node
kubectl list /pods
The following is a sample of the output that will appear:
core@master ~ $ kubectl list /pods ID Image(s) Host Labels Status 115bbe15-49ff-11e4-91b7-08002794b041 stratos-php 172.17.8.100/ name=php,replicationController=php Waiting 115cc7e9-49ff-11e4-91b7-08002794b041 stratos-php 172.17.8.101/ name=php,replicationController=php Waiting
Tail the Kubernetes log
ssh to master node
journalctl -f
Restart the Kubernetes scheduler
ssh to master node
systemctl restart scheduler
List all the Docker containers in a node
ssh to the node
docker ps
The following is a sample of the output that will appear:
core@master ~ $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS 37e3303eb337 stratos-php:latest "/bin/sh -c '/usr/lo 2 minutes ago Up a3f787d0a7ae kubernetes/pause:latest "/pause" 2 minutes ago Up 0.0.0.0:80->80/tcp
Get the IP address of a Docker container
ssh to the node
docker inspect CONTAINER-ID | grep IPAddress
The following is a sample of the output that will appear:
core@master ~ $ docker inspect a3f787d0a7ae | grep IPAddress IPAddress": "10.100.56.3",
SSH to a Docker container
- ssh to the node
ssh root@CONTAINER-IPAddress
- enter
gas the password
Kill a Docker container
ssh to the node
docker kill CONTAINER-ID
The following is a sample of the output that will appear:
core@minion-1 ~ $ docker kill 6f5ba525f9ab 6f5ba525f9ab
Another container will be created within a few seconds.
Get info of a specific replicationController as a JSON
ssh to the master node
kubectl -json get /replicationControllers/REPLICATION-CONTROLLER-ID
The following is a sample of the output that will appear:
core@master ~ $ kubectl -json get /replicationControllers/test2.php.domain
{"kind":"ReplicationController","id":"test2.php.domain","creationTimestamp":"2014-10-02T07:44:58Z","resourceVersion":6701,"apiVersion":"v1beta1","desiredState":{"replicas":2,"replicaSelector":{"name":"test2.php.domain"},"podTemplate":{"desiredState":{"manifest":{"version":"v1beta1","id":"","volumes":null,"containers":[{"name":"test2-apachestratos-org","image":"54.254.64.141:5000/stratos-php","ports":[{"name":"tcp80","hostPort":80,"containerPort":80,"protocol":"tcp"}],"env":[{"name":"SERVICE_NAME","key":"SERVICE_NAME","value":"php"},{"name":"HOST_NAME","key":"HOST_NAME","value":"test2.apachestratos.org"},{"name":"MULTITENANT","key":"MULTITENANT","value":"false"},{"name":"TENANT_ID","key":"TENANT_ID","value":"-1234"},{"name":"TENANT_RANGE","key":"TENANT_RANGE","value":"-1234"},{"name":"CARTRIDGE_ALIAS","key":"CARTRIDGE_ALIAS","value":"test2"},{"name":"CLUSTER_ID","key":"CLUSTER_ID","value":"test2.php.domain"},{"name":"CARTRIDGE_KEY","key":"CARTRIDGE_KEY","value":"uLBSXhS3Kzos5xVe"},{"name":"REPO_URL","key":"REPO_URL","value":"null"},{"name":"PORTS","key":"PORTS","value":"80"},{"name":"PROVIDER","key":"PROVIDER","value":"apache"},{"name":"PUPPET_IP","key":"PUPPET_IP","value":"127.0.0.1"},{"name":"PUPPET_HOSTNAME","key":"PUPPET_HOSTNAME","value":"puppet.raj.org"},{"name":"PUPPET_DNS_AVAILABLE","key":"PUPPET_DNS_AVAILABLE","value":"null"},{"name":"PUPPET_ENV","key":"PUPPET_ENV","value":"stratos"},{"name":"DEPLOYMENT","key":"DEPLOYMENT","value":"default"},{"name":"CEP_PORT","key":"CEP_PORT","value":"7611"},{"name":"COMMIT_ENABLED","key":"COMMIT_ENABLED","value":"false"},{"name":"MB_PORT","key":"MB_PORT","value":"1883"},{"name":"MB_IP","key":"MB_IP","value":"172.17.42.1"},{"name":"CEP_IP","key":"CEP_IP","value":"172.17.42.1"},{"name":"MEMBER_ID","key":"MEMBER_ID","value":"test2.php.domaindb8e4a24-17e8-40a2-ad85-e0d0ca127887"},{"name":"LB_CLUSTER_ID","key":"LB_CLUSTER_ID"},{"name":"NETWORK_PARTITION_ID","key":"NETWORK_PARTITION_ID"},{"name":"KUBERNETES_CLUSTER_ID","key":"KUBERNETES_CLUSTER_ID","value":"KubGrp1"},{"name":"KUBERNETES_MASTER_IP","key":"KUBERNETES_MASTER_IP","value":"127.0.0.1"},{"name":"KUBERNETES_PORT_RANGE","key":"KUBERNETES_PORT_RANGE","value":"4000-5000"}]}],"restartPolicy":{"always":{}}}},"labels":{"name":"test2.php.domain"}}},"currentState":{"replicas":2,"podTemplate":{"desiredState":{"manifest":{"version":"","id":"","volumes":null,"containers":null,"restartPolicy":{}}}}},"labels":{"name":"test2.php.domain"}}
Update a specific replicationController
- Get the replication controller info as a json as above and save it to a file
kubectl -json get /replicationControllers/REPLICATION-CONTROLLER-ID >> rep-controller.json
- Edit the
rep-controller.json(for example, set replicas to 0) - Update the
replicationController.
kubectl -c rep-controller.json update /replicationControllers/REPLICATION-CONTROLLER-ID
The following is a sample of the output that will appear:
core@master ~ $ kubectl -c raj.json update /replicationControllers/test2.php.domain ID Image(s) Selector Replicas test2.php.domain 54.254.64.141:5000/stratos-php name=test2.php.domain 0
This will delete all the pods immediately.
Delete a pod
- ssh to the master node
- get the pod ID using
kubectl list /pods
kubectl delete pods/POD-ID
The following is a sample of the output that will appear:
core@master ~ $ kubectl delete pods/3ed5c5a6-4a0a-11e4-91b7-08002794b041 I1002 08:01:25.351501 02112 request.go:292] Waiting for completion of /operations/67 Status success
Delete a replicationController
- ssh to the master node
- Get the replicationController ID using
kubectl list /replicationControllers
kubectl delete replicationControllers/REPLICATION-CONTROLLER-ID
The following is a sample of the output that will appear:
core@master ~ $ kubectl delete /replicationControllers/test2.php.domain I1002 08:32:47.187198 02150 request.go:292] Waiting for completion of /operations/86 Status success
If you unsubscribe from the cartridge, the replicationControllers, pods and containers for that service cluster will be wiped out.
Destroy a Kubernetes cluster
Navigate to the folder that has the Kubernetes setup.
For example:cd kubernetes-vagrant-setup
Destroy the cluster.
vagrant destroy -f
Remove the Vagrant file.
rm -rf .vagrant/
Check the CoreOS version
Execute the following command to check the CoreOS version being used for the Kubernetes cluster:
cat /etc/os-release
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