Automating Linux and Unix System Administration (Expert's Voice in Linux)

The writer focuses exclusively on how UNIX and Linux method directors can use famous instruments to automate projects, even throughout a number of systems.

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Three. organize the hostgroup import within the hostgroup mapping dossier PROD/inputs/ hostgroups/cf. hostgroup-mappings. four. devote the alterations on your operating replica, and replace the construction operating replica at the cfengine grasp. Subversion Backups The method to again up a Subversion repository is sort of basic. we will use the svnadmin command with the hotcopy argument to correctly lock the repository and practice a file-based backup. Backing up this manner is far better than acting a cp or rsync reproduction of the repository records, which would lead to a corrupted backup. Use the command like this: The repository made by way of svnadmin hotcopy is totally sensible; we can drop it rather than our present repository may still anything get it wrong. we will be able to create periodic backups of our repository this fashion and replica the backups to a different host on our community or perhaps to an exterior website. bear in mind that every time a scorching replica is made, it's going to burn up the same quantity of disk house because the unique repository. Backup scripts that make a number of copies utilizing svnadmin hotcopy might want to be cautious to not refill the neighborhood disk with backups. We’ll create a script at PROD/repl/admin-scripts/svn-backup with those contents (explained part by means of section): on account that we copied the script to all hosts on our community, we took steps to ensure that it simply runs at the right host: BACKUP-BASE-DIR=/var/backups LOCKFILE=/root/svn-backup-lock We’ll be utilizing dossier locking to avoid invocations of this script from working straight away. We wrote a subroutine to control our kept backup directories. It takes a controversy of a repository listing that should be subsidized up, and it strikes any numbered backup directories to a brand new backup listing with the quantity incremented through one. A backup listing with the quantity 7 is got rid of, for the reason that we simply store seven of them. for instance, the listing /var/backups/binary-server/backup. 7/ is got rid of, and the listing /var/backups/binary-server/backup. 6/ is moved to the identify /var/backups /binary-server/backup. 7/. The subroutine then progresses backward numerically from five to one, relocating each one listing to a different listing with a similar identify other than the quantity incremented via 1. while it really is performed, there isn't any listing named /var/backups/ binary-server/backup. 1/, that's the listing identify we’ll use for a brand new Subversion backup: during this part, we practice those steps:1. Retrieve simply the fast component of the listing identify utilizing the basename command in order that the variable SHORTNAME includes the price binary-server or cfengine—the repository listing names. 2. We then ensure that the listing used for the backups exists and create it if important. three. Now that the listing is understood to exist, we modify listing to the correct backup listing and use our subroutine that rotates the former backup directories. four. Then we use the svnadmin hotcopy command to create a brand new backup of the repository. this is often performed for every listing indexed within the variable SVN-REPOS. eventually, we got rid of the lock dossier that's used to avoid of those from operating without delay.

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