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Latest Posts
- My Home Lab Network Diagram Posted on October 31, 2015
- Grepping for PHP system level command functions Posted on September 20, 2015
- Setting up Graphite on CentOS 6.x gotcha Posted on September 12, 2015
- VirtualBox: Increase guest VM CPU count Posted on July 18, 2015
- BIND - Typo caused slave zone transfer to stop working Posted on July 17, 2015
October 31, 2015
My Home Lab Network Diagram
by Alpha01
It’s Friday night, I don’t have anything interesting to do, so I created a diagram of my current home lab setup.
ubuntu networking kvm virtualbox September 20, 2015
Grepping for PHP system level command functions
by Alpha01
grep --color -r -E -e '(escapeshellarg|escapeshellcmd|exec|passthru|proc_close|proc_get_status|proc_nice|proc_open|proc_terminate|shell_exec|system)(\s+)?\(' ./
php security September 12, 2015
Setting up Graphite on CentOS 6.x gotcha
by Alpha01
I installed graphite-web via the EPEL repo, and I was getting an 500 error when accessing the Graphite web interface.
Error
[Sat Sep 12 00:56:27 2015] [error] [client 192.168.1.21] mod_wsgi (pid=17318): Exception occurred processing WSGI script '/usr/share/graphite/graphite-web.wsgi'.
[...]
[Sat Sep 12 00:56:27 2015] [error] [client 192.168.1.21] File "/usr/lib/python2.6/site-packages/django/db/backends/sqlite3/base.py", line 344, in execute
[Sat Sep 12 00:56:27 2015] [error] [client 192.168.1.21] return Database.Cursor.execute(self, query, params)
[Sat Sep 12 00:56:27 2015] [error] [client 192.168.1.21] DatabaseError: attempt to write a readonly database
Fix
It turns out the sqlite3 database file Graphite write’s too, was owned by root. So it was simply a matter of updating the ownership to what ever user Apache is running under, in my case it’s apache.
chown -R apache.apache /var/lib/graphite-web/
centos monitoring July 18, 2015
VirtualBox: Increase guest VM CPU count
by Alpha01
Syntax
VBoxManage modifyvm <VMNAME> –cpus <CPUcount>
tony@mini02:~$ VBoxManage showvminfo monitor | grep "Number of CPUs"
Number of CPUs: 1
tony@mini02:~$ VBoxManage modifyvm monitor --cpus 3
tony@mini02:~$ VBoxManage showvminfo monitor | grep "Number of CPUs"
Number of CPUs: 3
virtualbox July 17, 2015
BIND - Typo caused slave zone transfer to stop working
by Alpha01
I was surprised to see a typo had caused all slave transfers to shit themselves. I came across a situation where a new slave zone was specified to a non-existing location in the file system and that caused the rest of the slave zones to get permission denied errors when trying to update.
Error
Jul 12 03:23:27 ns2 named[1184]: dumping master file: etc/zones/tmp-Zbk9acg9uv: open: permission denied
Jul 12 03:27:50 ns2 named[1184]: dumping master file: etc/zenos/tmp-4yxBXaUMTq: open: file not found
Jul 12 03:29:46 ns2 named[1184]: dumping master file: etc/zones/tmp-KPqzHa9ev9: open: permission denied
Jul 12 03:38:02 ns2 named[1184]: dumping master file: etc/zones/tmp-kuhtUPjcAi: open: permission denied
bind