How to Upgrade

If you’re doing an upgrade install (rather than a fresh install), there’s two suggested approaches: either install Bro using the same installation prefix directory as before, or pick a new prefix and copy local customizations over.

In the following we summarize general guidelines for upgrading, see the Release Notes for version-specific information.

Reusing Previous Install Prefix

If you choose to configure and install Bro with the same prefix directory as before, first stop all running Bro instances in your cluster (if using BroControl, issue the “broctl stop” command on the manager host). Next, make a backup of the Bro install prefix directory.

During the upgrade, any file in the install prefix may be overwritten or removed, except for local customization of files in the $prefix/share/bro/site and $prefix/etc directories ($prefix indicating the root of where Bro was installed). Also, logs generated at run-time won’t be touched by the upgrade.

After upgrading, remember to check the $prefix/share/bro/site and $prefix/etc directories for files with a file extension of .example, which indicate that the distribution’s version of the file differs from the local one, and therefore, may include local changes. Review the differences and make adjustments as necessary. Use the new version for differences that aren’t a result of a local change.

Finally, if using BroControl, then issue the “broctl deploy” command. This command will check for any policy script errors, install the new version of Bro to all machines in your cluster, and then it will start Bro.

Using a New Install Prefix

To install the newer version in a different prefix directory than before, first stop all running Bro instances in your cluster (if using BroControl, then issue a “broctl stop” command on the manager host). Next, install the new version of Bro in a new directory.

Next, copy local customization and configuration files from the $prefix/share/bro/site and $prefix/etc directories to the new location ($prefix indicating the root of where Bro was originally installed). Review the files for differences before copying and make adjustments as necessary (use the new version for differences that aren’t a result of a local change). Of particular note, the copied version of $prefix/etc/broctl.cfg is likely to need changes to any settings that specify a pathname.

Finally, if using BroControl, then issue the “broctl deploy” command. This command will check for any policy script errors, install the new version of Bro to all machines in your cluster, and then it will start Bro.


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