Summary

• Preambule: Softwares to install before connecting to a distant linux server
• Practice 1: Get connecting on a linux server by ssh
• Practice 2: Reserve one core of a node using srun and create your working folder
• Practice 3: Transfering files with filezilla sftp
• Practice 4: Transfering data to the node scp
• Practice 5: Use module environment to load your tool
• Practice 6: Launch analyses
• Practice 7: Transfering data to the nas servers scp
• Practice 8: Deleting your temporary folder
• Practice 9: Launch a job via sbatch
• Links
• License

Preambule

Getting connected to a Linux servers from Windows with SSH (Secure Shell) protocol

Platform	Software	Description	url
	mobaXterm	an enhanced terminal for Windows with an X11 server and a tabbed SSH client	more
	putty	Putty allows to connect to a Linux server from a Windows workstation.	Download

Transferring and copying files from your computer to a Linux servers with SFTP (SSH File Transfer Protocol) protocol

Platform	Software	Description	url
	filezilla	FTP and SFTP client	Download

Viewing and editing files on your computer before transferring on the linux server or directly on the distant server

Practice 1: Get Connecting on a linux server by ssh

In mobaXterm:

1. Click the session button, then click SSH.
   • In the remote host text box, type: bioinfo-master.ird.fr
   • Check the specify username box and enter your user name
2. In the console, enter the password when prompted. Once you are successfully logged in, you will be use this console for the rest of the lecture.
3. Type the command sinfo and comment the result
4. Type the command sinfo -N nodes --long and notice what have been added
5. Type the command scontrol show nodes

Practice 2: Reserve one core of a node using srun and create your working folder

1. Type the command squeue and noticed the result
2. Type the command squeue -u your_login with your_login to change with your account and notice the difference
3. More details with the command: squeue -O "username,name:40,partition,nodelist,NumCPUs,state,timeused,timelimit"
4. Type the command srun -p short --pty bash -i then squeue again
5. Create your own working folder in the /scratch of your node:

cd /scratch
 mkdir login
 with login : the name of your choice

Practice 3 : Transferring files with filezilla sftp

Download and install FileZilla

Open FileZilla and save the IRD cluster into the site manager

In the FileZilla menu, go to File > Site Manager. Then go through these 5 steps:

1. Click New Site.
2. Add a custom name for this site.
3. Add the hostname bioinfo-nas.ird.fr to have access to /data2/formation
4. Set the Logon Type to “Normal” and insert your username and password used to connect on the IRD cluster
5. Press the “Connect” button.

Transferring files

1. From your computer to the cluster : click and drag an text file item from the left local colum to the right remote column
2. From the cluster to your computer : click and drag an text file item from he right remote column to the left local column
3. Retrieve the file HPC_french.pdf from the right window into the folder /data/projects/formation/

Practice 4: Transfer your data from the nas server to the node

1. Using scp, transfer the folder TPassembly located in /data2/formation/Slurm into your working directory
2. Check your result with ls

Practice 5: Use module environment to load your tools

1. Load the abyss 1.9.0 module
2. Check if the tool is loaded

Practice 6 : Launch analyses

Perform an assembly with abyss-pe

With abyss software, we reassembly the sequences using the 2 fastq files ebola1.fastq and ebola2.fastq

Launch the command

abyss-pe k=35 in='ebola1.fastq ebola2.fastq' name=k35

Practice 7: Transfering data to the nas server

1. Using scp, transfer your results from your /scratch/login to your /home/login
2. Check if the transfer is OK with ls

Practice 8: Deleting your temporary folder

 cd /scratch
rm -r login

exit

Practice 9: Launch a job with sbatch

Following the several steps performed during the practice, create a script to launch the analyses made in practice6:

1er step: create the Slurm section in your script

1) Set a name for your job

2) Precise your email

3) Choose the short parttion

2nd step: type the commands you want the script to launch:

1) create a personal folder in /scratch with mkdir

2) Using scp, transfer the folder TPassembly located in /data2/formation into your working directory

3) Launch abyss version 1.9.0 with module load

4) Into the the folder TPassembly/Ebola, lanch the following command:

abyss-pe k=35 in='ebola1.fastq ebola2.fastq' name=k35

5) Using scp, transfer your results from your /scratch/login to your /home/login

6) Delete the personal folder in the /scratch

Launch the following commands to obtain info on the finished job:

seff <JOB_ID>
sacct --format=JobID,elapsed,ncpus,ntasks,state,node -j <JOB_ID>

Bonus:

We are going to launch a 4 steps analysis:

1) Perform a multiple alignment with the nucmer tool

2) Filter these alignments with the delta-filter tool

3) Generate a tab file easy to parse the with show-coords tools

4) Generate a png image with mummerplot

• Retrieve the script /data2/formation/Slurm/scripts/alignment_slurm.sh into your /home/login

• modify the Slurm section and the variables

• launch the script with sbatch:

 sbatch alignment.sh

• Do a ls -altr in your /home/login. What do you notice?

• Launch the following commands to obtain info on the finished job:

seff <JOB_ID>
sacct --format=JobID,elapsed,ncpus,ntasks,state,node -j <JOB_ID>

• Open filezilla and retrieve the png image to your computer

• Launch the following commande to clear the /scratch of the node

sh /opt/scripts/scratch-scripts/scratch_use.sh

and choose the number of the node used

Links

• Related courses : Linux for Dummies
• Tutorials : Linux Command-Line Cheat Sheet

License

The resource material is licensed under the Creative Commons Attribution 4.0 International License (here).