enhance zkServer.sh for easier zookeeper automation-izing
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Key: ZOOKEEPER-905
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-905
Project: Zookeeper
Issue Type: Improvement
Components: scripts
Affects Versions: 3.3.1
Reporter: Nicholas Harteau
Priority: Minor
Attachments: zkServer.sh.diff
zkServer.sh is good at starting zookeeper and figuring out the right options to
pass along.
unfortunately if you want to wrap zookeeper startup/shutdown in any significant
way, you have to reimplement a bunch of the logic there.
the attached patch addresses a couple simple issues:
1. add a 'start-foreground' option to zkServer.sh - this allows things that
expect to manage a foregrounded process (daemontools, launchd, etc) to use
zkServer.sh instead of rolling their own to launch zookeeper
2. add a 'print-cmd' option to zkServer.sh - rather than launching zookeeper
from the script, just give me the command you'd normally use to exec zookeeper.
I found this useful when writing automation to start/stop zookeeper as part of
smoke testing zookeeper-based applications
3. Deal more gracefully with supplying alternate configuration files to
zookeeper - currently the script assumes all config files reside in $ZOOCFGDIR
- also useful for smoke testing
4. communicate extra info ("JMX enabled") about zookeeper on STDERR rather than
STDOUT (necessary for #2)
5. fixes an issue on macos where readlink doesn't have the '-f' option.
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