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upgrade ubuntu

Upgrade from 14.04 to 15.04 is a 2 step journey.

sudo nano /etc/update-manager/release-upgrades
change the value to normal

And then use this command twice!
sudo do-release-upgrade

You can check your ubuntu version:

lsb_release -a
Description: Ubuntu 15.04

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Libre office on centOS

Here is how to install Libre office on centOS

64 bit
wget download.documentfoundation.org

32 bit
wget download.documentfoundation.org

tar xvf LibreOffice_4.4.4_Linux_x86_rpm.tar.gz

rpm -Uvh LibreOffice_4.4.4.3_Linux_x86_rpm/RPMS/*.rpm

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manage iso image file

Here is how you can open and copy files from an iso image.

mkdir /mnt/iso
mount -t iso9660 -o loop /root/Downloads/ubuntu-15.04-desktop-i386.iso /mnt/iso/

ls /mnt/iso/

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Create a Reverse SSH Tunnel

on Remote server:
ssh -fN -R 7000:localhost:22 username@yourMachine-ipaddress

Now do an ssh connection request from your machine to your own machine at port 7000:
ssh username@localhost -p 7000

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avoid key prompt

Here is a simple tip that will avoid RSA key fingerprint authentication. Edit /etc/ssh/ssh_config for global configuration or ~/.ssh/config for user-specific configuration.

Host 192.168.0.*
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null

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Killing mysql

Here are a few ways to kill mysql process.

mysqladmin shutdown
kill -TERM nnnn
killalll mysqld
kill -TERM pidof mysqld
kill -TERM cat /var/run/mysqld.pid

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Managing top

While the output of the top command displayed, press F, which will display all fields available for sorting, press n (which is for sorting the processes by Memory) and press enter.

press c, which will display full pathname of running processes

press 1 (number one), which will display the performance data of the individual CPUs.

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Know more about your server

You can get information about the make, model and serial number of the equipment as shown below:

dmidecode -t system

What is the maximum RAM supported by the system?

dmidecode -t 16

Currently installed RAM

cat /proc/meminfo | grep -i memtotal

Memory slots occupied

/usr/sbin/dmidecode -t 17 | grep -i size

// know more about running processes

dstat

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Sending file attachments

Here is a quick way to send files from any server where mutt is installed.

echo "Attaching a file " | mutt -s "file attachment" -a /root/somefile.txt -- your.name@gmail.com

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correcting date

A few packages are dependent upon the server time. If the date is incorretly set, it will throw an exception as shown below.

s3cmd ls

ERROR: S3 error: 403 (RequestTimeTooSkewed): The difference between the request time and the current time is too large.

/sbin/ntpdate ntp.ubuntu.com

Afer updating the date using ntpdate command, the s3cmd command started working as expected.

date command can also be used

date +%Y%m%d -s "20130514"

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