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This page is for all the users that are not used to manage linux environment.


Add/delete a user in your virtual machine

In order to add the user and set his/her password  use following commands

sudo /usr/sbin/adduser <username> 

sudo chage -d 0 <username>

After you need to modify the file /etc/ssh/sshd_config, enabling the PasswordAuthentication and then restart and check the SSH deamon:

Ubuntu: 

sudo systemctl restart sshd.service

sudo systemctl status sshd.service

CentOS:

sudo systemctl restart sshd.service

sudo systemctl status sshd.service


In order to delete a user and his/her HOME directory just execute the command:

deluser --remove-home <username>


Grant a user root privileges in your virtual machine

  • It is possible to grant a user with root privileges using O the command adduser instead of useradd when the new user is created: 

    sudo /urs/sbin/adduser <username> sudo

    Otherwise you can add the following line in the section #User privilege specification of  the file /etc/sudoers:

  • <username> ALL=(ALL:ALL) ALL


How to mount remote filesystem with FUSE (Filesystem in USEr space) on CentOS or Ubuntu

  • On CentOS:  - You will need to install a few packages that are not available in the standard CentOS repository. So, you must enable the EPEL repo:

    yum install epel-release -y 

    - Install FUSE (Filesystem in USEr space) and SSHFS packages 

    yum install fuse sshfs
    - Load the FUSE module

    modprobe fuse

    - Confirm that the FUSE module is loaded 

    lsmod | grep fuse
    fuse                  84368    2


  • - Optionally, make sure the FUSE module is loaded upon a reboot 

    echo "modprobe fuse" >> /etc/rc.local 

  • - Using SSHFS. Once the FUSE module is loaded, you can mount your remote partition using SSHFS:

    sshfs user@remote_host:/remote_directory  /local_mount_partition

    If you have configured the login via ssh key authorization, you can use the following command:

    sshfs user@remote_host:/remote_directory  /local_mount_partition -o IdentityFile=<absolute-path-with-key>


    Note: If appear the following error 

    fuse: bad mount point `/local_mount_partition': Transport endpoint is not connected

    execute:      sudo fusermount -u /local_mount_partition


On Ubuntu:  - First you have to install FUSE and SSHFS packages with the apt-get comand:

apt-get install fuse 


apt-get install sshfs


Once the FUSE module is loaded, you can mount your remote partition using SSHFS:


sshfs user@remote_host:/remote_directory  /local_mount_partition


If you have configured the login via ssh key authorization, you can use the following command:


sshfs user@remote_host:/remote_directory  /local_mount_partition -o IdentityFile=<absolute-path-with-key>



Note: If appear the following error 


fuse: bad mount point `/local_mount_partition': Transport endpoint is not connected


execute :  sudo fusermount -u /local_mount_partition


How to use and configure Docker in your virtual machine

To use Docker in your virtual machine please set the MTU value at 1400 in the file  /etc/docker/daemon.json.  More in particular edit the file /etc/docker/daemon.json and then set


      • {

        "mtu" : 1400

        }

For any questions please write to superc@cineca.it .

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