Kubernetes(2)Docker and Quickstart

Kubernetes(2)Docker and Quickstart

I already have the docker on my MAC, try to run redis
> docker run -d redis

> docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
82800f7eb4cc        redis               "docker-entrypoint.s…"   2 minutes ago       Up 2 minutes        6379/tcp            jolly_dubinsky

Enter that Redis docker
> docker exec -it 82800f7eb4cc /bin/bash

Once we are in that docker application, we can see the redis is running
> ps -ef | grep redis
redis        1     0  0 02:57 ?        00:00:00 redis-server *:6379
root        25    18  0 03:02 pts/0    00:00:00 grep redis

Get telnet back on my MAC
https://dor.ky/restore-telnet-in-mac-os-high-sierra-10-13/
> brew install telnet

Check if we can telnet to the Redis, No, because we did not mapping the port
> telnet localhost 6379
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host

Stop and remove the Redis application
>docker stop 82800f7eb4cc
82800f7eb4cc
>docker rm 82800f7eb4cc
82800f7eb4cc

Dynamic mapping
> docker run -d -P redis

We can telnet then
> telnet localhost 32768
Trying ::1...
Connected to localhost.
Escape character is '^]'.
STATS
-ERR unknown command 'STATS'
QUIT
+OK
Connection closed by foreign host.

Or mapping as follow
> docker run -d -p 6379:6379 redis

> telnet localhost 6379
Trying ::1...
Connected to localhost.
Escape character is '^]'.
MONITOR
+OK
QUIT
+OK
Connection closed by foreign host.

Set Up Kubernetes
The configuration file is here
/Users/hluo/.kube/config
/Users/hluo/.kube/config-dev
/Users/hluo/.kube/config-stage

Config is the one for my local kubernetes, the dev is for company’s DEV, stage is for stage.

Change and Switch the Kube Config
> export KUBECONFIG=~/.kube/config-dev
> echo $KUBECONFIG
/Users/hluo/.kube/config-dev

Check the cluster info
> kubectl cluster-info

Start the proxy
> kubectl proxy
Starting to serve on 127.0.0.1:8001

Visit the UI
http://localhost:8001/ui

Hapened to delete the minikube in VirtualBox, restart that with these command
> rm -rf ~/.minikube
> minikube start

Check my Kubernetes
> export KUBECONFIG=~/.kube/config

> kubectl cluster-info
Kubernetes master is running at https://192.168.99.100:8443
KubeDNS is running at https://192.168.99.100:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy

> kubectl proxy
Starting to serve on 127.0.0.1:8001

UI page is here
http://192.168.99.100:30000

Stop the local cluster
> minikube stop


References:
http://sillycat.iteye.com/blog/2415445