plist files in the directory ~/ Library/ LaunchAgents. When a user signs in, launchctl reads all the. We can see a list of everything launchctl is running by issuing the command: launchctl list It is used to manage the computers networking, voice over, USB and other long running processes. Launchctl is what OSX uses to load daemons and agents in the background. launchctl load ~ /Library/ LaunchAgents / homebrew. If the file is modified in either spot, it will modify the original file. Here we / usr/ local/ opt/ postgressql, but the computer also thinks it is also at another URI, ~/ Library/ LaunchAgents. plist file in / usr/ local/ opt/ postgressql and creates a symbolic link in the ~/ Library/ LaunchAgents directory.Ī symbolic link creates a reference to a file, this allows the file seem like it is in many different locations but is only in one. Here is an explainshell breaking down the ln -svf command. ln - sfv / usr / local / opt / postgresql /*.plist ~/Library/LaunchAgents Let’s talk about what each of these commands does so we understand why it runs automatically. If desired, the postgres server can be configured to launch as a deamon in the background every time the user signs in: ln - sfv / usr / local / opt / postgresql /*.plist ~/Library/LaunchAgents launchctl load ~/Library/LaunchAgents/ Automatically running the Postgres server as a daemon There are two ways to run the postgres server as a daemon on OSX, automatically and manually. The best part is, we don’t need to have an extra terminal window open. The postgres server works great as a daemon, because it will keep running until told to stop or the computer is shut down. A daemon is a program that runs in the background, sometimes for long periods of time, that doesn’t interact with the user. This is why it is recommended to launch the postgres as a daemon. If for some reason the terminal closes or the connection to the terminal stops then the postgres server shuts down. The problem with running the postgres server in the foreground is it needs to be ran in a terminal - and the terminal needs to stay open. (Remember if you want to exit psql you can quit by typing \q and then enter or just press ctrl d) In another terminal window we can now access the database with the psql command. The -D argument tells postgres where the database is. We can run the server in the foreground by using the postgres command: postgres - D / usr / local / var / postgres In order to access a PostgreSQL database, the postgres server needs to be running. plist file which contains some metadata about how to launch Postgres. usr/ local/ opt/ postgresql contains a. usr/ local/ var/ postgres is where the database and logs are stored This command will install Postgres into your /usr/local directory and adds the following directories: If you don’t have Homebrew installed or know what it does I suggest you, check it out. In addition, it discusses how to connect to the server with the psql command. It discusses how to launch the server in the foreground from the terminal or in the background as a daemon / agent. This article covers installation the postgres server on OSX. Install and Run Postgres on OSX :: Jordan Majd ◄ ◆ Sunday, December 6, 2015Install and Run Postgres on OSX
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