Create user Ubuntu with the command and directory restriction

 Create User:

    sudo useradd -m user_name -s /bin/rbash

    sudo passwd user_name

    Enter password

Make Directory and grant permission  

    sudo mkdir /home/user_name/bin

    sudo chown root. /home/user_name/.profile

    sudo chmod 755 /home/user_name/.profile

Restrict Directory and access

sudo vim /home/user_name/.profile

################ADD BELOW IN FILE#######

# if running bash

if [ -n "$BASH_VERSION" ]; then

    # include .bashrc if it exists

    if [ -f "$HOME/.bashrc" ]; then

. "$HOME/.bashrc"

    fi

fi

# set PATH so it includes user's private bin if it exists

PATH=$HOME/bin

export PATH

#########################################

Assign Commands

sudo ln -s /bin/grep /home/user_name/bin/tail

sudo ln -s /bin/cat /home/user_name/bin/cat

sudo ln -s /bin/echo /home/user_name/bin/more

Create SFTP user with home directory restriction

 

Restrict on the home directory and sftp only Ubuntu

create a group -
 
sudo addgroup group_name

create a user

useradd -m -d /home/username username

Assign group to user

usermod -g group_name username


restrict the directory and ftp

add below to the end of /etc/ssh/sshd_config file

   Match Group group_name
   ChrootDirectory /home/username
   ForceCommand internal-sftp
   X11Forwarding no
   AllowTcpForwarding no

Still unable to log in to sftp try to change the ownership to root for the user's home directory. 

Also check the mod of the home directory, it should be 755

Upgrade GLIBC Rhel/CentoOs

To upgrade glibc below package are reuqired.

glibc glibc-common glibc-devel glibc-headers glibc-static glibc-utils Download the above packages from below link, and copy in /tmp directoyr. Download Package From here

Make sure all above package should be in same version.

go to the /tmp directory and execute below command to update the packages. rpm -Uvh glibc-2.17-55.el6.x86_64.rpm \ glibc-common-2.17-55.el6.x86_64.rpm \ glibc-devel-2.17-55.el6.x86_64.rpm \ glibc-headers-2.17-55.el6.x86_64.rpm \ glibc-static-2.17-55.el6.x86_64.rpm \ glibc-utils-2.17-55.el6.x86_64.rpm Check the lattest install version. rpm -qa |grep glibc

Mount FTP share locally in Linux using ftpfs

Mount FTP share locally in Linux using ftpfs

 To mount a remote FTP account to locally on Linux system- 

1)Install required Packages

2)Mounting system with remote details

3)Testing

1) - Install fuse-curlftpfs package on you Linux system.

2)- After package installation need to create a mount point(directory) and mount ftp server data using curlftpfs command, to do this you must have ftp details. 

Consider below details.
 
 ftp User: altmish
 ftp Password: tech2smooth
 ftp Host:- ftp.tech2smooth.in
 Mount Directory:-  /usr/ftp_data

Create the mount point and mount ftp account data.
[root@localhost /]#mkdir /usr/ftp_data
[root@localhost /]#curlftpfs -o altmish:tech2smooth@ftp.tech2smooth.in /usr/ftp_data

Note: Above mounted data will be accessible only for the user who mounted the system. To make it public-ally accessible use below.


[root@localhost /]#curlftpfs -o allow_other altmish:tech2smooth@ftp.tech2smooth.in /usr/ftp_data

 3)- Go to ftp data directory

[root@localhost /]#cd /usr/ftp_data

[root@localhost /]#ls -ltrh

Memory Leak in tomcat

To prevent this particular memory leak you should edit your tomcat/conf/server.xml and change

<Listener  lassName="org.apache.catalina.core.JreMemoryLeakPreventionListener" />

to

<Listener 
className="org.apache.catalina.core.JreMemoryLeakPreventionListener"
classesToInitialize="com.mysql.jdbc.NonRegisteringDriver" />

Error parsing HTTP request header- Invalid character found in the request target.

Http11Processor.service Error parsing HTTP request header
 Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
 java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986

Solution

Edit catalina.properties add below line in end of the file.

tomcat.util.http.parser.HttpParser.requestTargetAllow=|{}

 

 

Unable to Start MySQL Linux - Please read "Security" section of the manual....

ISSUE- [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root


Solution- Start mysql using below command.

/usr/sbin/mysqld --user=root --daemonize --pid-file=/var/run/mysqld/mysqld.pid