Chapter 4. Post Installation Configuration

If you did not configure networking during the installation you may configure it post-installation using the nmcli tool. The following commands create a network connection called atomic, set up a host name, and then activate that connection.

nmcli con add type ethernet con-name atomic ifname eth0
nmcli con modify my-office my-office ipv4.dhcp-hostname atomic ipv6.dhcp-hostname atomic
nmcli con up atomic

# nmcli con add type ethernet con-name atomic ifname eth0
# nmcli con modify my-office my-office ipv4.dhcp-hostname atomic ipv6.dhcp-hostname atomic
# nmcli con up atomic

For more details on how to use the nmcli tool, see Section 2.3.2. Connecting to a Network Using nmcli in the Red Hat Enterprise Linux 7 Networking Guide.

To enable software updates, you must register your Red Hat Enterprise Linux Atomic Host installation. This is done with the subscription-manager command as described below. By default, subscription-manager assumes that your system has Internet access with the ability to reach Red Hat software repositories. If you don’t have direct Internet access, you have a couple of options:

sudo subscription-manager register --username=<username> --auto-attach

$ sudo subscription-manager register --username=<username> --auto-attach

A properly registered system will display both IDs as is shown below:

sudo subscription-manager list

$ sudo subscription-manager list
+-------------------------------------------+
    Installed Product Status
+-------------------------------------------+
Product Name:   Red Hat Enterprise Linux Atomic Host
Product ID:     271
Version:        7
Arch:           x86_64
Status:         Subscribed
Status Details:
Starts:         02/27/2015
Ends:           02/26/2016

Product Name:   Red Hat Enterprise Linux Server
Product ID:     69
Version:        7.1
Arch:           x86_64
Status:         Subscribed
Status Details:
Starts:         02/27/2015
Ends:           02/26/2016

The subscription-manager command is also documented in Registering from the Command Line of the Red Hat Subscription Management guide.

Currently, some system users that in Red Hat Enterprise Linux 7 would be listed in the /etc/passwd file have been relocated into the read-only /usr/lib/passwd file. Because applications on Red Hat Enterprise Linux Atomic Host are run inside Linux containers, this does not affect deployment. The traditional user management tools, such as useradd, write locally added users to the /etc/passwd file as expected.