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December 16, 2014

Setting up HAProxy with SSL

Filed under: Linux — Tags: , , , , — admin @ 2:02 pm

Well today I was set up a haproxy to use ssl, and did’t figure out from first time how to get only one file for the pem.
In haproxy you have only one file with all certificates.

So the order is this:
cat >>
cat >>
cat intermediate.bundle >>

After this just add the
bind *:443 ssl crt /etc/ssl/
And you will have the right one.

October 29, 2014

chkconfig list ubuntu

Filed under: Linux — Tags: , — admin @ 10:52 am

Well on ubuntu I didn’t find a corresponding command to chkconfig list.
So a, easy way to find out what is running on startup is to run this:
And after you see what runlevel is you list the directory :
ls -ialh ls -ialh /etc/rcX.d/

Where X is the answer from runlevel

Also some equivalent command:
chkconfig –add
chkconfig –level 345 on
chkconfig –del

update-rc.d defaults
update-rc.d start 20 3 4 5
update-rc.d -f remove

May 9, 2014

apache child pid exit signal Segmentation fault

Filed under: Linux — Tags: , , , , , , , — admin @ 8:26 pm

Well today I face a strange problem. My apache start throw some segmentation fault into error log. So how to find out what is the problem ?

Well first of all we have to enable the coredump for apache, so in orde to do this we can add this line at the start of httpd.conf
CoreDumpDirectory /path
( Some put the path to /tmp directory but please be aware that for me core have 2.2G , so if you have a small /tmp partition you can put it in other place , but it have to be into a directory with same user/group as apache run ) .

We restart the apache and wait to see a segmentation fault again into error_log, and we will see that he say something about path also
For example:
[notice] child pid 4959 exit signal Segmentation fault (11), possible coredump in /var/www/html

If don’t say anything about path then something is not ok, most probably you have to check properties for path.

After this we find out where is located apache , so for this a
which httpd

Should be ok .
After this we have to run
gdb httpd_path core_path
gdb /usr/sbin/httpd /var/www/html/core

We will see something like this

Loaded symbols for /lib64/
Reading symbols from /usr/lib64/php/modules/ debugging symbols found)...done.
Loaded symbols for /usr/lib64/php/modules/
Reading symbols from /usr/lib64/gconv/ debugging symbols found)...done.
Loaded symbols for /usr/lib64/gconv/
Core was generated by `/usr/sbin/httpd'.
Program terminated with signal 11, Segmentation fault.
#0 0x00007f278f5a5c29 in zend_hash_index_find () from /etc/httpd/modules/
Missing separate debuginfos, use: debuginfo-install httpd-2.2.15-30.el6.centos.x86_64

Ok now we run
(gdb) where
And now is the magic to see what is causing the problem.

For me was
#0 0x00007f278f5a5c29 in zend_hash_index_find () from /etc/httpd/modules/
#1 0x00007f2789b98661 in my_copy_zval (dst=0x7f279e2e8dd0, src=0x7f2709eee8d0, ctxt=0x7fff0d4c3900) at /var/tmp/APC/apc_compile.c:314
#2 0x00007f2789b9176d in zif_apc_fetch (ht=, return_value=0x7f279e2e8dd0, return_value_ptr=, this_ptr=, return_value_used=)
at /var/tmp/APC/php_apc.c:858
#3 0x00007f278f5e8498 in ?? () from /etc/httpd/modules/
#4 0x00007f278f5bf5e0 in execute () from /etc/httpd/modules/
#5 0x00007f278f58ff35 in zend_call_function () from /etc/httpd/modules/
#6 0x00007f278f4e7c37 in ?? () from /etc/httpd/modules/
#7 0x00007f278f5e8498 in ?? () from /etc/httpd/modules/
#8 0x00007f278f5bf5e0 in execute () from /etc/httpd/modules/
#9 0x00007f278f5997ed in zend_execute_scripts () from /etc/httpd/modules/
#10 0x00007f278f547878 in php_execute_script () from /etc/httpd/modules/
#11 0x00007f278f622e55 in ?? () from /etc/httpd/modules/
#12 0x00007f279adfebb0 in ap_run_handler ()
#13 0x00007f279ae0246e in ap_invoke_handler ()
#14 0x00007f279ae0d96c in ap_internal_redirect ()
#15 0x00007f2791cfc855 in ?? () from /etc/httpd/modules/
#16 0x00007f279adfebb0 in ap_run_handler ()
#17 0x00007f279ae0246e in ap_invoke_handler ()
#18 0x00007f279ae0db30 in ap_process_request ()
#19 0x00007f279ae0a9a8 in ?? ()
#20 0x00007f279ae066b8 in ap_run_process_connection ()
#21 0x00007f279ae12977 in ?? ()
#22 0x00007f279ae12c8a in ?? ()
#23 0x00007f279ae1390c in ap_mpm_run ()
#24 0x00007f279adea900 in main ()

To quit from gdb we have to type quit .

For me the problem was the apc, I have increased the memory_limit, and the problem is fixed .

Also some interesting link I found here

Generate PHP core dumps on segfaults in PHP-FPM

January 29, 2014

How to display HTTP Headers with tcpdump

Filed under: Linux — Tags: , , , , — admin @ 9:19 pm

Well today I was needing to see some packages that arrived on apache. In order to see I have to use tcpdump, but you will only some short information if you are using basic.
In order to see HTTP header you have to use something like this:
tcpdump -n -vvvs 1024 -l -A host

If you want to see more information you have to increase the size, something like this
tcpdump -n -vvvs 1500-l -A host

November 28, 2013

ubuntu virtualbox networking not working

Filed under: Linux — Tags: , , — admin @ 10:20 am

Today I wanted to test something on a ubuntu server . So I start a virtualbox with it. However when it started there was no network. But only a error with 60 seconds to wait.
After long wait, the ubuntu server have started, but no network available . I have to mention that I use bridged adapter on virtual server.

The solution is to empty one file.
I did make a backup first with
cp /etc/udev/rules.d/70-persistent-net.rules /root

After this I have empty the file
echo ""> /etc/udev/rules.d/70-persistent-net.rules

And rebooted the server.
After this all was ok.

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