Reviving dead Centos 4 repos

Edit /etc/yum.repos.d/CentOS-Base.repo Comment out the “mirrorlist” entries. Uncomment the “baseurl” entries and change them to$basearch nJoy 😉

start docker with customer system name and hostname

docker run –name david -h david-01 -it david/c6nodepm2yo /bin/bash nJoy 😉 shows : docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES f4da454e156e david/c6nodepm2yo “/bin/bash” 12 seconds ago Exited (0) 3 seconds ago david d5ec5101ba52 david/centos6:node “/bin/bash” 27 hours ago Up 26 hours>80/tcp jovial_borg and when connected : [root@david-01 /]#

starting a machine in Docker with ports

docker run -p 800:80 -p 2222:22 -p  4443:443  -it 68715929d32a  /bin/bash If ports do not work check : sysctl net.ipv4.ip_forward if  you get: net.ipv4.ip_forward = 0 then issue : sysctl -w net.ipv4.ip_forward=1 net.ipv4.ip_forward = 1if you get the error :   docker: Error response from daemon: driver failed programming external connectivity on endpoint amazing_williams (44e256a6039741b20e4124800702d9794d69fb6be9da71ba25059de4dd527121):…

Centos 7 Firewall open a port

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…

Docker log files

Ubuntu – /var/log/upstart/docker.log Boot2Docker – /var/log/docker.log Debian, GNU/Linux – /var/log/daemon.log CentOS6 – /var/log/daemon.log | grep docker Fedora – journalctl -u docker.service OpenSuSE – journalctl -u docker.service on Centos 7 journalctl -u docker.service nJoy 😉

Docker Remote API on CentOS

After installing Docker on CentOS we need to Docker remote API port on CentOS. $ cat /etc/sysconfig/docker other_args="" Edit the file /etc/sysconfig/docker as below. other_args="-H tcp:// -H unix:///var/run/docker.sock" After that, restart docker and try to access the host from another host. $ sudo /etc/init.d/docker restart … $ curl $hostname:4243/images/json … For a systemd based Distro…

Save SSL keys for AWS Cloudfront

Assuming you have AWS cli installed : aws iam upload-server-certificate –server-certificate-name –certificate-body file://public.key –private-key file://private.key –certificate-chain file://bundle.pem –path /cloudfront/ nJoy 😉  

hex2bin in node.js

Basically it’s all over-engineered and does not work well. responses are out of alignment and though text-wise they are the same bit wise everything is all over the place : curl | xxd 00000000: de56 a735 4739 c01d f2dc e14b ba30 8af0 .Q.%G9…..;.0.. curl | xxd 00000000: c39e 56c2 a725 4739 c380 c3ad…

strace apache or process to detect bottlenecks

Sometimes you have a multi threaded / multi processed application and you need to see where are things hanging. ps auxw | grep sbin/apache | awk '{print"-p " $2}' | xargs strace   nJoy 😉