Since CentOS 6.x is an old distro it lacks newer GCC and thus you can’t use things like stack protector and some of the PAX security stuff
What you can do however, is to install the SCL repo and from there the devtoolset-4:
# yum install centos-release-scl.noarch centos-release-scl-rh.noarch
# yum install devtoolset-4 devtoolset-4-gcc-plugin-devel.x86_64
The above will install gcc [...]
After yum or apt-get upgrade you are left with services that need to be restarted in order to start using the new libraries you have just upgraded.
Sometimes you know what to restart but if you haven’t done upgrade in a while it is highly possible that you can miss a service.
The following simple two liner [...]
Yesterday I had a very interesting conversation about congestion control and how it affects long lived connections.
So I decided to do a very simple comparison. I created a 100MB file(dd if=/dev/zero of=test-file bs=1M count=100).
Scalable:
test-file 100%[==============================================>] 100.00M 5.13MB/s in 23s
2016-02-28 19:40:55 (4.35 MB/s) - ‘test-file’ saved [104857600/104857600]
Illinois:
test-file 100%[==============================================>] 100.00M 4.20MB/s in 24s
2016-02-28 19:21:57 (4.13 [...]
Bird’s memory usage with 8 BGP sessions (6 of which full BGP tables):
root@sfgw:~# birdc show memory
BIRD 1.5.0 ready.
BIRD memory usage
Routing tables: 160 MB
Route attributes: 136 MB
ROA tables: 112 B
Protocols: 68 kB
Total: [...]
I finally decided to request full BGP tables from all of my ISPs, so I can easily change the preferred path to certain destinations.
However this meant that now I have to monitor both the state of the BGP sessions, but also the amount of routes that I receive from my neighbors.
Before my days with full [...]
Since I’m a long user of Xchat I decided to upgrade it and found that it does not compile with the recent glib library.
The problem is that the new versions of the glib library introduced one limitation for includes. Now you only have to include glib.h and every more specific inclusion breaks the builds.
Even thou [...]
Very often I login on machines with older mii-tool that reports 1Gbit/s cards as if they are connected on 100Mbit/s. This is normal as mii-tool is depricated. But a lot of old timers like me are used to its output. So I wrote a very simple awk script which can convert the ethtool output to [...]
Recently I wanted to check if I have reached the limit of my network connection. However I constatly had to login on my router and check the traffic on each interface… and I had to watch it continiously.
.
So I decided that I’ll write a tool which will collect the information and regulary update a DB, [...]
Today I decided to join my co-located server to pool.ntp.org.
It was surprisingly easy and now I have my machine contributing to the big effort that is pool.ntp.org.
Statistics for it can be found here: http://www.pool.ntp.org/user/hackman
Since I started using Linux::Unshare after I created my Linux::Setns I found that unshare was missing a few tests.
I added them and sent a patch to the current maintainer Boris Sukholitko. However a few days later he wrote to me that he is no longer maintaining the module and proposed that I should take over [...]
