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Create UPCA in Font Creating Users and Groups

Creating Users and Groups
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We ll create two different users and groups: one will be the owner of the LightTPD process, and the other will be the owner of the FastCGI and spawner processes. (The spawner is a separate process running in the background that makes sure that the specified amount of FastCGI processes is running at all times.) Log in to the remote machine and execute the following commands: $ sudo addgroup rails $ sudo useradd -g rails -d /home/lighttpd rails
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CHAPTER 12 APPLICATION DEPLOYMENT
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This creates the rails user and group, and sets the home directory to /home/rails. Next, create the home directory and set the access rights with the following commands: $ sudo mkdir /home/rails $ sudo chown rails /home/rails $ sudo chgrp rails /home/rails You should also add the rails user to the list of sudoers by executing the visudo command: $ sudo visudo This allows the user to gain administrator rights through the sudo command. The visudo command opens the file /etc/visudoers in an editor. Add the following to the end of that file: %rails ALL=(ALL) ALL We also need to create the user and group that will own the LightTPD processes. This is done by executing the following commands on the production machine: $ sudo addgroup lighttpd $ sudo useradd -g lighttpd -d /home/lighttpd lighttpd The first command creates the lighttpd group. The second creates a user named lighttpd that belongs to the lighttpd group. We also specify the home directory for the new user account, which doesn t exist yet. Create this directory and give the appropriate rights to it by executing the following commands: $ sudo mkdir /home/lighttpd $ sudo chown lighttpd /home/lighttpd $ sudo chgrp lighttpd /home/lighttpd Note that the user that LightTPD runs under is specified in the configuration file with the
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server.username and server.groupname options.
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You should also set a sensible password for both the lighttpd and rails users using the
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passwd command, as shown here:
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$ sudo passwd rails Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully
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Starting LightTPD
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Now that we have the project on the production machine, we can start LightTPD by using the lighttpd command and specifying the location of the configuration file: $ sudo lighttpd -f /u/apps/emporium/current/config/lighttpd-production.conf
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CHAPTER 12 APPLICATION DEPLOYMENT
We start LightTPD using the sudo command because the server needs to bind to the restricted port 80. You can verify that LightTPD is running by executing the following command: $ ps -ef|grep lighttpd
lighttpd
0 13:53
00:00:00 lighttpd -f /u/apps/emporium/
Note that the process is running under the lighttpd user we just created, even though we started it using the sudo command and another user. This is because we set the server.username and server.groupname parameters to lighttpd in the lighttpd configuration file.
Starting FastCGI Processes
Before starting the FastCGI processes, we need to change the group ownership of the application directory to rails with the following command: $ sudo chgrp -R rails /u/apps/emporium/current/ $ sudo chown -R rails /u/apps/emporium/current/ Next, start the FastCGI processes (and the application) by executing the following commands: $ su - rails
Password:
$ /u/apps/emporium/current/script/process/spawner -p 7000 -i 4 Checking if something is already running on port 7000...NO Starting FCGI on port: 7000 spawn-fcgi.c.190: child spawned successfully: PID: 4289 Checking if something is already running on port 7001...NO Starting FCGI on port: 7001 spawn-fcgi.c.190: child spawned successfully: PID: 4291 Checking if something is already running on port 7002...NO Starting FCGI on port: 7002 spawn-fcgi.c.190: child spawned successfully: PID: 4293 Checking if something is already running on port 7003...NO Starting FCGI on port: 7003 spawn-fcgi.c.190: child spawned successfully: PID: 4295
CHAPTER 12 APPLICATION DEPLOYMENT
The spawner script automatically starts the number of FastCGI processes specified with the i parameter. As you can see from the example, the spawner script starts four processes listening on ports 7000, 7001, 7002, and 7004. Capistrano expects to find a spinner script that it can execute to start (spawn) your application, so save the following in scripts/spin: /u/apps/emporium/current/script/process/spawner -p 7000 -i 4 --repeat=60 Notice that we added the repeat option, which keeps the spawner process running. The spawner checks (every 60 seconds) that all FastCGI processes are running, and starts them again if they crash.
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