Use this command to find your active zone(s): firewall-cmd –get-active-zones It will say either public, dmz, or something else. You should only apply to the zones required. In the case of dmz try: firewall-cmd –zone=dmz –add-port=2888/tcp –permanent Otherwise, substitute dmz for your zone, for example, if your zone is public: firewall-cmd –zone=public –add-port=2888/tcp –permanent Then…
In recent CentOS version 6.3 is an unresolved bug, which causes the network card to freeze the server. Following message appears in /var/log/messages kernel To work around the problem you will need to turn off Active-State Power Management (ASPM) (Feature that saves power in the Peripheral Component Interconnect Express (PCI Express or PCIe) subsystem by…
1) Install the following: xorg-x11-xauth xorg-x11-fonts-* xorg-x11-utils 2) Enable the following in the sshd_config file X11Forwarding yes 3) Use an appropriate X-Server on your desktop nJoy 😉
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Gather a list of ips which fail logins and drop from firewall for the future lastb | awk '{ FS == "[ \t]+" ; print $3; }' | egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}'| grep -v "192.168." | sort | uniq | xargs -n 1 -I {} iptables -A INPUT -s {} -j DROP if you want to…
Just a simple command: rndc retransfer domain.com nJoy 😉
This was a weird one. It took me ages to discover why SSH X11 died at some point after tuning a box. It so happens that disabling IPv6 ( not used on my networks) is assumed in SSH at some point and if you disable it (which many people say is a way to avoid…
The ssh password-less login works in a  simple way. Though sometime people find it confusing. The basics: >  Client side has a private key pointed to by >  Server side has the public key of the client. On your client box create a public and private key set using (for putty) puttygen. (In linux all…
When I needed ImageMagick on Centos the default installer came with a version some 400 verison back. Installing the latest version was a bit wiry so here it goes: wget “http://www.imagemagick.org/download/linux/CentOS/i386/ImageMagick-6.8.6-9.i386.rpm” yum install bzip2-devel freetype-devel libjpeg-devel libpng-devel libtiff-devel giflib-devel zlib-devel ghostscript-devel djvulibre-devel libwmf-devel jasper-devel libtool-ltdl-devel libX11-devel libXext-devel libXt-devel lcms-devel libxml2-devel librsvg2-devel OpenEXR-devel yum install…
When not sure which route is applied on CentOS use: ip -s route show cache 192.168.14.24 nJoy 😉
