Trying to understand why mail is not being sent ? [For Sendmail] If your tail -f /var/log/maillog logs are showing something like this: Aug 30 22:43:06 netman sendmail[8100]: starting daemon (8.14.4): SMTP+queueing@01:00:00 Aug 30 22:43:06 netman sm-msp-queue[8109]: starting daemon (8.14.4): queueing@01:00:00 Aug 30 22:43:11 netman sendmail[8102]: q7SIq1Kk011256: to=<david.saliba@jial.com>, ctladdr=<root@netman.lan> (0/0), delay=2+04:51:10, xdelay=00:00:05, mailer=esmtp, pri=3720580, relay=alt4.jial-smtp-in.l.gogglee.com. [XX.125.142.26],…
Month: August 2012
Creating a router on a CentOS 6 server
Assuming you want to NAT the network on eth1 and route the traffic to eth0 this is the spell: Create the forwarding rule: /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE and then enable IP forwarding echo “1” > /proc/sys/net/ipv4/ip_forward OR sysctl -w net.ipv4.ip_forward=1 Permanent setting using /etc/sysctl.conf If we want to make…
Windows time stamping in batch files
Creating a time-stamp in windows can be usful for the automated backups we all SHOULD be doing 🙂 pkzip c:\<source>\*.* c:\<target>\TempZip.zip ren C:\<target>\TempZip.Zip c:\<target>\TempZip_%date:~-4,4%%date:~-7,2%%date:~-10,2%.zip Or simply to create a directory for copying open files (Lawrence 🙂 ) set backdir=%date:~-4,4%%date:~-7,2%%date:~-10,2% mkdir %backdir% cd %backdir% etc..
Allow remote SQL connection to Mysql from any host
Allowing the login of a user from any host in Mysql is simple: mysql> select host, user from mysql.user; +—————+——+ | host | user | +—————+——+ | 127.0.0.1 | root | | localhost | root | | minimal01.lan | root | +—————+——+ 3 rows in set (0.00 sec) mysql> update mysql.user set host=’%’ where host=’127.0.0.1′;…
CENTOS 6 Minimal does not have the Network interfaces up by default
So test drove CentOS 6 Minimum install .. Only real hiccup till now is : TUV ( the upstream vendor) aka RHEL decided to disable the network interfaces by default. WTF to that. A glance at the FAQ will show the solution : Here’s my version for multiple interfaces. # cd /etc/sysconfig/network-scripts/ # sed…
Enable Hybernation and do it Windows 7 / 2008 / R2 command line
The more time passes the closer to Unix style Windows gets. :\Users\Administrator>powercfg -h on :\Users\Administrator>shutdown -h That’s all !
Enable grub menu UBUNTU
Enable grub menu: edit the /etc/default/grub file and change the GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true to GRUB_HIDDEN_TIMEOUT=10 GRUB_HIDDEN_TIMEOUT_QUIET=false Save and call: sudo update-grub from a terminal, and reboot.
List or Check Installed Linux Kernels Debian
On Debian based systems like Ubuntu: # dpkg –list | grep linux-image To list / display current kernel Type the following command: # uname -r # uname -mrs
List or Check Installed Linux Kernels RPM based
With rpm based OSes # rpm -qa kernel This will list the available kernels. To list / display current kernel Type the following command: # uname -r # uname -mrs
Manually reset the state of an instance
If an instance gets stuck in an intermediate state (e.g., “deleting”), you can manually reset the state of an instance using the nova reset-state command. This will reset it to an error state, which you can then delete. For example: $ nova reset-state c6bbbf26-b40a-47e7-8d5c-eb17bf65c485 $ nova delete c6bbbf26-b40a-47e7-8d5c-eb17bf65c485 You can also use the –active to force the instance back…