- There are various ways to check the health and services on
a box. From space issues, to resolving process problems, or even
just performing analysis, the following commands can be used
by themselves or even in combination.
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- To check process status
-
- ps
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- To check processes for a specific application
- In this example, we're looking for any process that has 'https'
in it's name or directory string.
- > ps -ef | grep https
-
- In this example, we're looking for any process that might
be running as a specific user id. (abcuser)
- > ps -ef | grep abcuser
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- To kill a process
-
- kill
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- Occassionally a process will need to be terminated. The kill
command is used to do this. List the processes currently running
(use the ps command). You'll get something back that looks like
this:
-
- root 19976 1
0 Jun 09 ?
0:01 /www/apache/bin/httpsd.prefork -d /www/servers/ie3
-D
- nobody 20296 19976 0 Jun 09 ?
0:11 /www/apache/bin/httpsd.prefork -d /www/servers/ie3
-D
-
- The process ids are the 1st 2 numbers. The first number (ie:
20296) is the number for that process listed on the same line.
The second number is the parent process (ie: 19976) which spawned
the process. For instance, process 1 listed above (root 19976)
spawned process 2 (nobody 20296).
-
- When you want to stop a process, you want to stop both the
child processes and the parent. But you should stop the children
first. You can do this in one continual line as:
- > kill -9 20296 19976
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- To check a service connection
-
- telnet
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- Projects often use various servers to support their applications.
Such as database, mail, logic or file transfer servers. If something
happens to an application that requires checking on the connections
between servers, you can use the telnet commant to verify if
the other server and/or port is listening.
- > telnet boxname port#
- (ie: telnet appbox100 5460)
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