SLAC network 101

Read: Remote access to facethome and facet-srv01

Read: SSH

FastX

• https://fastx3.slac.stanford.edu:3300/ (webbrowser)
• If the resolution is not high enough, e.g., to open camera monitors: turn off smart scaling and increase the resolution

  

Connecting to the SLAC network via ssh

• ssh smeuren@fastx3.slac.stanford.edu -Y
• ssh smeuren@centos7.slac.stanford.edu -Y
• ssh smeuren@rhel6-64.slac.stanford.edu -Y

Control computers

See also:  Data Analysis

• • fphysics@facet-srv01
  • fphysics@facet-srv20 (DAQ)
  • fphysics@facet-srv20-2 (newest, most powerful, DAN)
  • Screen grabber usually runs on  lcls-srv02: login via ssh physics@lcls-srv02 -Y

Login to the control servers

1. 1. get onto the SLAC network if you are not there (e.g., fastx3.slac.stanford.edu); use "-Y" for x-forwarding
   2. log onto mcclogin:  ssh smeuren@mcclogin -Y
   3. log onto the control server (list: see above), e.g.: ssh fphysics@facet-srv20 -Y
   4. if it asks you for a password, you do not have an account (see "get access to the control server below")

Save typing time

• • Shortcut for ssh:
    export    fx=smeuren@fastx3.slac.stanford.edu
    export    cent=smeuren@centos7.slac.stanford.edu
    alias sshfx="ssh $fx -Y"
    alias sshcent="ssh $cent -Y"
  • put such aliases into ~/.cshr or ~/.bashrc (depending on the shell)

Login via ssh without password

1. 1. Generate a key on your local computer (default options, empty passphrase): "ssh-keygen -t rsa"
      
   2. Find the folder where the "authorized_keys" folder is located on the remote server:
      
   3. Let the server know that you are authorized to login without password:
      
      • cat /home/seb/.ssh/id_rsa.pub | ssh smeuren@fastx3.slac.stanford.edu 'cat >> /home/smeuren/.ssh/authorized_keys'
      • Note that you need to change username / servername and the location of "authorized_keys" (pwd when you log into the server should help; see step b)
      • login without password

ssh with port tunnel

• • creating a port tunnel to the FACET control server: ssh fphysics@facet-srv01 -Y -R 42000:e320pi:42000

    (note difference between local and remote port forwarding, i.e., direction: server on remote or server on local -L / -R)

Get access to the control server

• get an fphysics account: Remote access to facethome and facet-srv01

• after you have access: follow instructions given directly after login to create your personal profile

Troubleshooting

• Read: SSH
• In case your login fails: test "klist". If there is nothing, do kinit
  
  
  
  
• If you don't have write access to your AFS filesystem or you have some issues with ssh-keys that cannot be read: aklog. After this, klist should read similar to this:
  

Various Tricks

Screen capture on control computer

mccsg

Copying files to the SLAC cluster (AFS file system):

from computer to cluster:
scp -r "local file path"  smeuren@rhel6-64.slac.stanford.edu:/afs/slac.stanford.edu/u/gu/smeuren/ 

from cluster to control server:
smeuren@mcclogin $ scp -r /afs/slac.stanford.edu/u/gu/smeuren/ "filename" fphysics@facet-srv01:/home/fphysics/smeuren/

Facet-II elog

http://physics-elog.slac.stanford.edu/facetelog/index.jsp

• Print screenshot to FACET elog
  log onto the control computer → mccsg

Getting internet access on the control network (webbrowser)

• ssh to mcclogin (-Y), ssh to, e.g., fastx3
• run firefox there

SLACK

• https://slack.com/workspace-signin
• The workspace is "facet-II"

Google drive

see: FACET-II Home