Posted on in System Administration
As every system administrator is aware, keeping precise time on your servers can be critical. For example, if you use QueueMetrics for your Asterisk-based call center and the QM and MySQL servers are running with different times, users will notice confusing behavior as calls seem to arrive in the future …
Posted on in System Administration
Configuring your syslog server to accept logging output from your Cisco routers and switches requires a few basic steps. We'll assume that you are using a new server and haven't made any previous changes to the syslog configuration. I use <acronym title="Red Hat Enterprise Linux">RHEL</acronym> 5 most …
Posted on in System Administration
If you've ever seen this, you've felt my pain:
# mount -vv -t nfs4 slap:/export/a/b/c /mnt
mount: pinging: prog 100003 vers 4 prot tcp port 2049
mount.nfs4: slap:/export/a/b/c failed, reason given by server: No such file or directory
My original thought was …
Posted on in System Administration
If you're using Red Hat Enterprise Linux (RHEL) or one of it's variants (CentOS,
etc.), you may have noticed that using a non-standard document root for your
Apache-based web site results in a DocumentRoot does not exist warning if
the directory exists. The most likely cause of this problem is …
Posted on in system_administration
If you have been following our
TCP Performance Tuning series, you'll know
that we want to enable RFC 1323 Window Scaling and increase the TCP window size
1 MB. To do this, we'll add the following lines to /etc/sysctl.conf and issue
sudo sysctl -p to apply the changes …
Posted on in system_administration
Note: Although this is a continuation of the TCP Performance Tuning article series, it's also valuable as a standalone reference.
This is a list of 14 congestion control algorithms available in TCP. I'm presenting it in alphabetical order.
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