Linux_tips

mongoDB – under SUSE SLE11 – SP3

Getting started with mongoDB under Suse Linux. Installation:

zypper addrepo --no-gpgcheck http://repo.mongodb.org/zypper/suse/11/mongodb-org#
sudo zypper install mongodb-org
vi /etc/mongod.conf

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zypper addrepo --no-gpgcheck http://repo.mongodb.org/zypper/suse/11/mongodb-org#

sudo zypper install mongodb-org

vi /etc/mongod.conf

Note: Default port is 27017 Starting/Stopping mongoDB server:

sudo service mongod start
sudo service mongod stop

1 2	sudo service mongod start sudo service mongod stop

Verify server status:

tail -f /var/log/mongodb/mongod.log

1	tail -f /var/log/mongodb/mongod.log

Make it part of the autostart for different run levels:

sudo chkconfig mongod on

1	sudo chkconfig mongod on

Getting started with mongoDB

Hide/Show Desktop Icons on SUSE

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Sometimes it is desirable to have a clean desktop. The following steps will allow you to achieve that with minimal commands.

- open a terminal
- type gconf-editor
- navigate apps/nautilus/desktop
- Select/De-select the items you want to display on the desktop.
- Exit from there and you are done!

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- open a terminal

- type gconf-editor

- navigate apps/nautilus/desktop

- Select/De-select the items you want to display on the desktop.

- Exit from there and you are done!

dummy sendmail

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Lets say you are developing an app that sends mail, but you don’t want to actually send any mails out. The answer for your quest is “dummy sendmail”

#!/bin/bash
# replace the /usr/bin/sendail with this shell script.
# Everytime someone sends a mail, the content of the mail will be written to a file under /tmp/mail.20150203.log

TS=`date "+%Y%m%d"`
FN="/tmp/mail.$TS.log"

cat - >> $FN
echo "=== End Of Message Received ===" >> $FN

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#!/bin/bash

# replace the /usr/bin/sendail with this shell script.

# Everytime someone sends a mail, the content of the mail will be written to a file under /tmp/mail.20150203.log

TS=`date "+%Y%m%d"`

FN="/tmp/mail.$TS.log"

cat - >> $FN

echo "=== End Of Message Received ===" >> $FN

sudo config

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sudo is a standard way to give users some administrative rights without giving out the root password. This can also be configured for non root users as well.

vi /etc/sudoers and add the following line
Syntax:
       user hosts = (runas) commands

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vi /etc/sudoers and add the following line

Syntax:

user hosts = (runas) commands

# user john is allowed to run some_script.sh as jack with no password
john ALL = (jack) NOPASSWD: /work/some_script.sh

1 2	# user john is allowed to run some_script.sh as jack with no password john ALL = (jack) NOPASSWD: /work/some_script.sh

# Any user part of the opsgrp will be allowed to mount and unmount squashfiles as root with no password.
User_Alias OPSACC = %opsgrp
OPSACC ALL = (root) NOPASSWD: /bin/mount -t squashfs -o loop *, /bin/umount -t squashfs *

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# Any user part of the opsgrp will be allowed to mount and unmount squashfiles as root with no password.

User_Alias OPSACC = %opsgrp

OPSACC ALL = (root) NOPASSWD: /bin/mount -t squashfs -o loop *, /bin/umount -t squashfs *

sftp only access (no shell access)

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groupadd sftponly_group
useradd -d /home/sftp_dir/ -g sftponly_group -s /bin/false sftp_user

1 2	groupadd sftponly_group useradd -d /home/sftp_dir/ -g sftponly_group -s /bin/false sftp_user

Add the following lines to /etc/ssh/sshd_config

Match Group sftponly_group
ChrootDirectory %h
AllowTcpForwarding no
X11Forwarding no
ForceCommand internal-sftp -l INFO -f AUTH

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Match Group sftponly_group

ChrootDirectory %h

AllowTcpForwarding no

X11Forwarding no

ForceCommand internal-sftp -l INFO -f AUTH

Make sure to restart sshd daemon.

command > some_file.txt 2>&1

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What does 2>&1 do in a linux console?

I ran into this with CentOS 5. Where the default editor for the system is set to nano! I like vi and wanted to change the default to it. login to the system vi .bashrc Add the following two lines to .bashrc

export EDITOR="vim"
export VISUAL="vim"

1 2	export EDITOR="vim" export VISUAL="vim"

run the command, source .bashrc A change to /etc/bashrc will make it a system wide change

Virtualbox dhcp set

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VBoxManage.exe dhcpserver add --ip 10.0.7.1 --netmask 255.255.255.0 --lowerip 10.0.7.2 --upperip 10.0.7.10 --enable --netname intnet

1	VBoxManage.exe dhcpserver add --ip 10.0.7.1 --netmask 255.255.255.0 --lowerip 10.0.7.2 --upperip 10.0.7.10 --enable --netname intnet

Simple all mail relay

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You have a server who’s IP is already white listed on your mail server & you wanted this server to pass all outgoing mails to the company’s mail server. This method basically eliminates the need for a mail server to be running on the local box.

- vi /etc/mail.rc and add the following line to it.
  set your.valid.mail.com

1 2	- vi /etc/mail.rc and add the following line to it. set your.valid.mail.com

Archives

mongoDB – under SUSE SLE11 – SP3

Hide/Show Desktop Icons on SUSE

LAMP – install on Ubuntu

dummy sendmail

sudo config

sftp only access (no shell access)

command > some_file.txt 2>&1

Change the default editor

Virtualbox dhcp set

Simple all mail relay

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