proc_applying-errata-to-multiple-hosts.adoc

Applying Errata to Multiple Hosts

Use these procedures to review and apply errata to multiple RHEL hosts.

Prerequisites

• Synchronize {ProjectName} repositories with the latest errata available from Red Hat. For more information, see [Synchronizing_Repositories_{context}].

• Register the hosts to an environment and Content View on {ProjectServer}. For more information, see {ManagingHostsDocURL}Registering_Hosts_managing-hosts[Registering Hosts] in {ManagingHostsDocTitle}.

• Configure the host for remote execution. For more information about running remote execution jobs, see {ManagingHostsDocURL}Configuring_and_Setting_Up_Remote_Jobs_managing-hosts[Configuring and Setting Up Remote Jobs] in {ManagingHostsDocTitle}.

Procedure

1. In the {ProjectWebUI}, navigate to Content > Content Types > Errata.

2. Click the name of an erratum you want to apply.

3. Click to Content Hosts tab.

4. Select the hosts you want to apply errata to and click Apply to Hosts.

5. Click Confirm.

CLI procedure

1. List all installable errata:

   # hammer erratum list \
   --errata-restrict-installable true \
   --organization "Default Organization"

2. Apply one of the errata to multiple hosts:

   Using Remote Execution

   # hammer job-invocation create \
   --feature katello_errata_install \
   --inputs errata=ERRATUM_ID \
   --search-query "applicable_errata = ERRATUM_ID"

   The following Bash script applies an erratum to each host for which this erratum is available:

   for HOST in hammer --csv --csv-separator "|" host list --search "applicable_errata = ERRATUM_ID" --organization "Default Organization" | tail -n+2 | awk -F "|" '{ print $2 }' ;
   do
     echo "== Applying to $HOST ==" ; hammer host errata apply --host $HOST --errata-ids ERRATUM_ID1,ERRATUM_ID2 ;
   done

   This command identifies all hosts with erratum_IDs as an applicable erratum and then applies the erratum to each host.

3. To see if an erratum is applied successfully, find the corresponding task in the output of the following command:

   # hammer task list

4. View the state of a selected task:

   # hammer task progress --id task_ID