Processes such as
mongodb have to be started manually each time after system restart on Mac and they occupy a terminal instance each. Daemonizing them will make the process to start automatically & without the need for a dedicated terminal.
There are two ways to daemonize a process in osx:
Both of which are managed by Launchd process running on osx.
The main difference between Agents & Daemons (:P Dan Brown) on osx is the time when process is executed. A Daemon process is executed as soon as the os is booted up whereas Agents are executed when a user has logged on.
Behaviour of Daemon/Agent is specified in a XML file called property list (.plist). Depending on where it is stored it will be treated as a Daemon or an Agent.
Here is the demonstration of creating Mongodb as a daemon in OSX (10.9.5) via User Agent. I am making it as a User Agent because I wanted to make it specific to the user.
Setting up MongoDB:
Unzip & copy files:
tar -xf mongodb-osx-x86_64-3.0.6.tgz cd mongodb-osx-x86_64-3.0.6 sudo cp bin/* /usr/local/bin
Create config file at
~/etc/mongo/mongod.conf. (Check out configuration options). Here is a sample config file:
systemLog: path: "/Users/username/logs/mongo/mongo.log" logAppend: true destination: file net: ipv6: true http: enabled: true RESTInterfaceEnabled: true storage: dbPath: "/Users/username/var/mongo"
Create DB folder
~/var/mongo/and logs folder
Creating User Agent:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>mongod</string> <key>ProgramArguments</key> <array> <string>/usr/local/bin/mongod</string> <string>--config</string> <string>/Users/username/etc/mongo/mongod.conf</string> </array> <key>RunAtLoad</key> <true/> <key>StandardErrorPath</key> <string>/Users/username/logs/mongo/mongo_stderr.log</string> <key>StandardOutPath</key> <string>/Users/username/logs/mongo/mongo_stdout.log</string> </dict> </plist>
Load agent job:
launchctl load ~/Library/LaunchAgents/mongo.plist
To check if the daemon/agent already exists:
launchctl list | grep "mongo"
Start the agent job:
launchctl start mongod
Ensure if the user agent is running:
ps aux | grep mongod