Backing up critical configuration data

About this task

The main OpsCenter configuration directory contains critical data, such as the opscenterd.conf configuration file. The cluster topology, configuration profiles, credentials, repositories, and job history for Lifecycle Manager (LCM) is stored in the lcm.db database. Your organization is responsible for backing up these files, in addition to the critical configuration data outlined in this procedure.

DataStax strongly recommends enabling automatic failover from the primary OpsCenter instance to a designated backup OpsCenter instance.

Location of the files used in this procedure
Filename	File Description	Paths per type of installation
lcm.db	Lifecycle Manager database	Package installations: /var/lib/opscenter/lcm.db Tarball installations: *install_location*/lcm.db
lcm.key	Lifecycle Manager database encryption key	Package installations: /etc/opscenter/lcm.key Tarball installations: *install_location*/keys/lcm.key
passwd.db	password database	Package installations: /etc/opscenter/passwd.db Tarball installations: *install_location*/passwd.db
opscenterd.conf	Opscenterd configuration	Package installations: /etc/opscenter/opscenterd.conf Tarball installations: *install_location*/conf/opscenterd.conf

The following steps indicate mirroring data between a primary OpsCenter instance and a backup OpsCenter instance.

Procedure

Mirror the contents of the main configuration directory on the primary OpsCenter instance to the backup OpsCenter instance.
- /etc/opscenter (package installs)
- install_location/conf (tarball installs)
```
scp /etc/opscenter/* secondary:/etc/opscenter
```
Do not mirror the failover_configuration_directory across OpsCenter installs when configuring OpsCenter to support failover.
Mirror the contents of the persist_directory location that indicates the current status of the Repair Service. The location of the persist directory for the Repair Service depends on the type of installation:
- /var/lib/opscenter/repair_service (package installs)
- install_location/repair_service (tarball installs)
```
scp /var/lib/opscenter/repair_service/* secondary:/var/lib/opscenter/repair_service
```
Repair Service progress is stored on the filesystem. If using an NFS mount to mirror to, the Repair Service starts up after a failover from approximately the same point where it was interrupted. If manually copying directories or using rysnc, the Repair Services resumes from whenever the Repair Service directory was last synced. Otherwise, the Repair Service simply restarts rather than continuing from where it left off.

The diagnostic tarball includes the repair persistence files. See repair_service_incremental.json file and repair_service_subrange.json file.
Back up the Lifecycle Manager database, encryption key, and security certificates:
1. Mirror the Lifecycle Manager database lcm.db:
  - /var/lib/opscenter/lcm.db (package installs)
  - install_location/lcm.db (tarball installs)
    
    scp /var/lib/opscenter/lcm.db secondary:/var/lib/opscenter/lcm.db
2. Mirror the Lifecycle Manager database encryption key lcm.key:
  - /etc/opscenter/lcm.key (package installs)
  - install_location/keys/lcm.key (tarball installs)
    
    scp /etc/opscenter/lcm.key secondary:/etc/opscenter/lcm.key
3. If Lifecycle Manager has generated any certificates for clusters configured to use node-to-node or client-to-node encryption, mirror the Lifecycle Manager certificate authority.
  - /var/lib/opscenter/ssl/lcm (package installs)
  - install_location/ssl/lcm/cacerts (tarball installs)
    
    scp -r /var/lib/opscenter/ssl/lcm secondary:/var/lib/opscenter/ssl/
If SSL is enabled, mirror the contents of the SSL configuration directory on the primary OpsCenter instance to the backup OpsCenter instance.
- /var/lib/opscenter/ssl (package installs)
- install_location/ssl (tarball installs)
  scp /var/lib/opscenter/ssl/* secondary:/var/lib/opscenter/ssl
If OpsCenter role-based security is enabled, mirror the roles and password database passwd.db:
- /etc/opscenter/passwd.db (package installs)
- install_location/passwd.db (tarball installs)
  scp /etc/opscenter/passwd.db secondary:/etc/opscenter/passwd.db

Backing up critical configuration data

About this task

Procedure

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