Jan 29 2009
SELinux can sometimes get
in your way. For example, I have had typical services, such as Apache, appear
to start up correctly, but remain inaccessible from the outside world because
I forgot to allow the apache user rights to open that port or maybe my distro
forgot about it. Before you turn off SELinux make sure you know why
you are turning it off and the security concerns you might be opening yourself
up to.
Jan 29 2009
I found this command useful in finding out which top 10 processes are hogging my CPU resources. Note that this command is specific to the Red Hat flavor of Linux. See the man page for ps for the correct output format to use for your specific platform:
Continua”Find CPU Hogs on a Redhat machine”
Jan 29 2009
Our db manager wanted to know the current patch level on our Solaris system
Here’s the commands.
#showrev -p
or
#patchadd -p
Recommend you use showrev -p since it’s a binary program. The patchadd utility is a script; therefore, it takes awhile to run.
To check the Solaris version cat /etc/release
Jan 29 2009
—————————————————————————-
List all services on at run level 1:
# chkconfig –list | grep 1:on
—————————————————————————-
Enable a service:
# chkconfig cups on
—————————————————————————-
Continua”Managing Init Scripts with chkconfig”
Jan 29 2009
awk is small, fast, and simple, unlike, say, perl. awk also has a
clean comprehensible C-like input language, unlike, say, perl. And
while it can’t do everything you can do in perl, it can do most things
that are actually text processing, and it’s much easier to work with.
Jan 16 2009
These are really great tips. I have used many of these tips during my time working as a systems administrator and they always come in handy.
The best systems administrators are set apart by their efficiency.
And if an efficient
systems administrator can do a task in 10 minutes that would take another
mortal two hours to complete, then the efficient systems administrator
should be rewarded (paid more) because the company is saving time, and
time is money, right?
Continua”IBM’s Lazy Linux Administrator Tips”
Jan 09 2009
This was very useful to me troubleshooting some nfs issues. I figured i post it here in case someone is having issues with NFS.
Careful analysis of your environment, both from the client and from the server
point of view, is the first step necessary for optimal NFS performance. The
first sections will address issues that are generally important to the client.
Later (Section 5.3 and beyond), server side issues will be discussed. In both
cases, these issues will not be limited exclusively to one side or the other,
but it is useful to separate the two in order to get a clearer picture of
cause and effect.
Jan 09 2009
DJG’s Sudo Guide
Created on January 1st, 2000.
sudo is a package which will allow priveleged users to run commands as other
users. This is sort of like assigning users to different groups to give them
special permissions to files. However, this can allow users acccess to
specific commands on specific machines, making it a more effective and more
organized way of giving special priveleges to users.
First, you’ll have to get the sudo package.
Continua”Configure the Sudo Command”
