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  • Committer: Aaron Bentley
  • Date: 2014-02-28 16:40:22 UTC
  • mto: This revision was merged to the branch mainline in revision 257.
  • Revision ID: aaron.bentley@canonical.com-20140228164022-kfip2tphn9m9invi
Add juju-backup script.

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juju-backup
 
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#!/bin/bash
 
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remote_cmd() {  
 
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        LIBJUJU=/var/lib/juju
 
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        # usage: execute message cmd [arg...]
 
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        # Execute the given command with the given arguments and exit with an
 
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        # error on failure. The first argument (message) describes the command.
 
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        execute() {
 
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                MSG=$1
 
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                shift
 
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                echo -n $MSG.....
 
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                ERR=$( "$@" 2>&1 ) || {
 
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                        echo FAILED
 
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                        echo '------------------------------------------------------------'
 
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                        echo "Command failed: $*"
 
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                        echo "Error: $ERR"
 
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                        echo '------------------------------------------------------------'
 
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                        exit 1
 
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                }
 
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                echo SUCCESS
 
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        }
 
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        next_step() {
 
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                echo
 
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                echo '**************************************************************'
 
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                echo $1
 
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                echo '**************************************************************'
 
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        }
 
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        cd ~                    # Make sure we've started in $HOME
 
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        next_step 'Preparing to perform backup'
 
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        if [ -e juju-backup.tgz ]; then
 
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                echo Older juju backup exists, moving to juju-backup-previous
 
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                execute 'Removing existing backup archive' rm -rf juju-backup-previous.tgz
 
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                execute 'Archiving backup' mv juju-backup.tgz juju-backup-previous.tgz
 
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        fi
 
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        execute 'Making backup directory' mkdir juju-backup
 
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        cd juju-backup
 
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        # Mongo requires that a locale is set
 
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        export LC_ALL=C
 
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        #---------------------------------------------------------------------
 
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        next_step 'Backing up mongo database'
 
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        execute 'Stopping mongo' stop juju-db
 
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        trap "start juju-db" 0          # ensure it starts again on failure
 
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        execute 'Backing up mongo' mongodump --dbpath $LIBJUJU/db
 
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        execute 'Backing up environ config' mongoexport \
 
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                --dbpath $LIBJUJU/db \
 
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                --db juju \
 
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                --collection settings \
 
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                --out environconfig.json
 
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        execute 'Starting mongo' start juju-db
 
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        trap - 0
 
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        next_step 'Copying Juju configuration'
 
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        copy_files() {
 
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                # Make an archive within the main archive so that we
 
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                # can easily preserve file ownership and other metadata.
 
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                tar -cf root.tar "$@" 2>&1 | (grep -v 'Removing leading'; true)
 
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        }
 
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        # Make copies of:
 
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        #   - Upstart configuration files for juju-db, machine agent, but not any unit agents.
 
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        #   - Agent configuration directories in $LIBJUJU.
 
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        #   (includes the config, server.pem, tools, but not any unit agents)
 
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        #   - SSH authorized keys.
 
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        #   - /etc/rsyslog.d/*juju* config files for the agents (ignore any unit agents)
 
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        #  - Juju logs for machine 0 and all machines.
 
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        execute 'Archiving selected files' copy_files \
 
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                /etc/init/juju-db.conf \
 
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                /etc/init/jujud-machine-*.conf \
 
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                $LIBJUJU/agents/machine-* \
 
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                $LIBJUJU/tools \
 
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                $LIBJUJU/server.pem \
 
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                ~/.ssh/authorized_keys \
 
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                /etc/rsyslog.d/*juju.conf \
 
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                /var/log/juju/all-machines.log \
 
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                /var/log/juju/machine-0.log \
 
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        #---------------------------------------------------------------------
 
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        next_step 'Creating tarball'
 
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        cd ..
 
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        execute 'Performing tar' tar -czf juju-backup.tgz juju-backup
 
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        rm -r juju-backup
 
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        execute 'Changing ownership of backup archive to ubuntu' chown -R ubuntu.ubuntu juju-backup*
 
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        echo
 
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        echo Juju backup finished.
 
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        echo
 
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}
 
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# Run the backup script on the remote machine.
 
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REMOTE_SCRIPT="
 
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        $(declare -f remote_cmd)
 
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        remote_cmd
 
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"
 
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QUOTED_SCRIPT="'$(echo "$REMOTE_SCRIPT" | sed "s/'/'\"'\"'/g")'"
 
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echo Connecting to machine 0
 
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juju ssh 0 "sudo -n bash -c $QUOTED_SCRIPT" && {
 
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        # The backup has succeeded; copy backup tarball locally.
 
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        NOW=$(date '+%Y%m%d-%H%M')
 
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        FILENAME=juju-backup-$NOW.tgz
 
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        echo "Copying tarball to `pwd`/$FILENAME ..."
 
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        juju scp 0:~/juju-backup.tgz ./$FILENAME
 
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}