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Creation deletion of Logical Partition and extended 1) List the Partition Table [root@localhost ~]# fdisk -l 2) Create Extended Partition on the New disk /dev/sdb fdisk /dev/sdb [root@localhost ~]# fdisk /dev/sdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk […] SUDO on Linux cat /etc/passwd test:x:500:500:test:/home/test:/bin/bash [root@localhost ~]# cp /etc/sudoers [root@localhost ~]# cp /etc/sudoers /etc/sudoers.org 1) Full Permission to User # User privilege specification test ALL=(ALL) ALL Let restart apache with out sudo [test@localhost ~]$ /etc/init.d/httpd restart rm: cannot remove `/var/run/httpd/httpd.pid’: Permission denied test@localhost ~]$ sudo /etc/init.d/httpd restart [sudo] password for test: […] Source is taken from http://www.linuxforu.com/2009/05/balancing-traffic-across-data-centres-using-lvs/ Fast SCP SCP is a great way to copy files from somewhere to somewhere else, but as we all know it can be slower than (insert slow metaphor here). Here’s a way you can get way speedier(really a word?) transfers using scp. scp -c arcfour -C sourcefile desthost: BY This way we can copy the […] Apache server behind a proxy server If you are using an apache server behind a proxy server, you may find that in your log files you will be given the proxy IP as the source IP of the connection. This is true, however you can adjust the apache log settings to pass the X-Forwarded-For […] Netstat netstat -antpuleo Will display the Timer running on the service Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name Timer tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 0 9169 1246/rpcbind off (0.00/0/0) tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 0 22083 14524/sshd off (0.00/0/0) tcp 0 0 0.0.0.0:36998 0.0.0.0:* LISTEN […] HTTPD process check The apache/httpd config file has a setting which determines how many running processes your apache /httpd daemon will commit to the system. The idea is, that if your web server needs more processes to handle more connections it will spawn a new child and serve the request. If it is able it […] Works on CENTOS AND FEDORA Prints the top 10 memory consuming processes TR=`free|grep Mem:|awk ‘{print $2}’`;ps axo rss,comm,pid|awk -v tr=$TR ‘{proc_list[$2]+=$1;} END {for (proc in proc_list) {proc_pct=(proc_list[proc]/tr)*100; printf(“%d\t%-16s\t%0.2f%\n”,proc_list[proc],proc,proc_pct);}}’|sort -n |tail -n 10 Pound Loadbalancer Pound is a bit more specific to HTTP/Web scenarios. It functions as a 100% Layer-7 load balancer as it does full HTTP(S) integration and has full access to the HTTP stack. What this means is that you can do some fancy routing based on cookies, url regex, and do this with SSL termination. […] Load balancer HAPROXY STUNNEL HAProxy Software Load Balancer HAProxy is a bit more bare metal as it targets a very specific set of scenarios focused on TCPIP more than HTTP. You can use cookie based injection with HAProxy to do round robin and stick users to a specific server. However, you can not do this […] |
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