Cloud Notes

VirtualBox local access

VirtualBox, VM's Network panel, click on advanced, click on Port Forwarding button. In there set up a rule:

Host IP: 127.0.0.1
Host Port: 2222
Guest IP: 10.0.2.15
Guest Port: 22

Then enable ssh in the guest, and connect from the host using:

$ ssh -p 2222 root@127.0.0.1

Vim line numbers

Create the file on ~/.vimrc and add:

set nu

Give run as root permission

oadm policy add-scc-to-user anyuid -z default

OpenShift admin login

To login as administrator:

$ oc login -u system:admin

Change the DHCP config for NAT network on VirtualBox

To change the range and ip, create the NAT network first and then adjust the values as needed:

$ VBoxManage dhcpserver modify --netname NatNetwork --ip 10.2.2.100 --netmask 255.255.255.0 --lowerip 10.2.2.101 --upperip 10.2.2.254 --enable

Docker login to push images in the registry

To log in to the registry directly:

Ensure you are logged in to OpenShift as a regular user:

$ oc login

Get your access token:

$ oc whoami -t

Give Cluster Admin role to a user:

$ oadm policy add-cluster-role-to-user cluster-admin <user_name>

Log in to the Docker registry:

$ docker login -u <username> -e <any_email_address> \
    -p <token_value> <registry_ip>:<port>

Check weather forecast by command line:

$ curl wttr.in/<city_name>

Create htpasswd user:

$ htpasswd -b /etc/origin/openshift-passwd demo demo

Debug containers:

$ oc run rheltest --image=registry.access.redhat.com/rhel7/rhel-tools --restart=Never --attach -i --tty