I am implementing a server storage setup making use of software RAID, LVM and LUKS.
I can think of three combinations this configuration could take:
In which order would these best be configured in, where best is in terms of security and maintainability?
If a node receives multiple, conflicting ARP replies, what happens?
I was recently going over some old mail logs, and I came across this:
Jun 12 14:51:56 hostname imapd: LOGIN FAILED, user=Purple, ip=[::ffff:127.0.0.1]
Jun 12 14:51:56 hostname postfix/smtpd[21538]: disconnect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:51:58 hostname postfix/smtpd[21536]: connect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:52:02 hostname postfix/smtpd[21537]: disconnect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:52:03 hostname imapd: LOGIN FAILED, user=Sports, ip=[::ffff:127.0.0.1]
Jun 12 14:52:07 hostname postfix/smtpd[21559]: connect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:52:09 hostname postfix/smtpd[21536]: disconnect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:52:11 hostname imapd: LOGIN FAILED, user=dragon, ip=[::ffff:127.0.0.1]
Jun 12 14:52:14 hostname postfix/smtpd[21562]: connect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:52:17 hostname postfix/smtpd[21559]: disconnect from 75-145-26-162-Washington.hfc.comcastbusiness.net[75.145.26.162]
Jun 12 14:52:18 hostname imapd: LOGIN FAILED, user=michael, ip=[::ffff:127.0.0.1]
Why would courier-imapd be reporting login failures coming from 127.0.0.1?
Edit: While squirrelmail is installed, it's restricted to one IP address, and there are no logs indicating it has been accessed. Further, I'm the sole user of the machine so it's definitely not me. :-)
When connecting to an service provided using anycast, I am experiencing different behaviour depending on whether the request is made using TCP or UDP.
With TCP, the request is made to address A, and the subsequent response also comes from A.
With UDP however, while the request is made to A, the response comes from address B.
Is this correct behaviour, or should the UDP response come from the same address it's sent to?
For some reason, it appears Tomcat is trying to hit its compilation cache when compilation failed.
For example, if I create a JSP containing nothing but Hello, <%=world%>!, predictably, I get an error: org.apache.jasper.JasperException: Unable to compile class for JSP. Subsequent requests however alternate between this and org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP.
Further, if I create a JSP containing Hello!, it of course works just fine. If I modify it contain Hello, <%=name%>!, the response alternates between the previously-mentioned compilation error, and the cached Hello!.
What's going on?
In Gentoo, what is the difference between mysql, mysql-community, and mysql compiled with --enable-community-features?