Intel® VTune™ Profiler User Guide

User Guide

Contents

Configure SSH Access for Remote Collection

To collect data on a remote Linux* system, a password-less SSH connection is required.
A root connection is required to load the sampling drivers and to collect certain performance metrics. You (or your administrator) can configure the system using root permissions and then set up password-less SSH access for a non-root user if desired. For example, build and load the sampling drivers on the target system using root access and then connect to the system and run analysis as a non-root user. If you set up access without using the sampling drivers, then driverless event-based sampling can still be used.
Use one of the methods below to enable password-less SSH access:
Versions of
Intel® VTune™
Profiler
 older than 2019 Update 5 have a different configuration for password-less SSH. For legacy instructions, see this article.

Enable a Password-less SSH Access from Windows to Linux

For Windows-to-Linux remote analysis, the
VTune
Profiler
 automatically configures a password-less access based on the public key identification.
  1. Create a
    VTune
    Profiler
     project.
  2. In the
    Configure Analysis
     window, select the
    Remote Linux (SSH)
     target system from the
    WHERE
     pane.
  3. Specify your remote system in the
    SSH destination
     field as
    user@target
    ; for example:
    root@172.16.254.1
    .
    VTune
    Profiler
     verifies your SSH connection and, if fails, it generates public/private keys required for enabling the password-less access and reports the results via an interactive terminal window.
  4. When the public/private keys are generated, press any key to enter your credentials and let
    VTune
    Profiler
    automatically
     copy and apply the public/private keys.
    Alternatively, you may press Ctrl-C to stop the automation. In this case, you need to
    manually
     add the already generated public/private keys from the paths specified in the terminal window to
    ~/.ssh/authorized_keys
    on the remote system.
    VTune
    Profiler
     does not keep your credentials but uses them only once to enable the password-less access.
When the keys are applied, the terminal window closes and you can proceed with the project configuration and analysis. For all subsequent sessions, you will not be asked to provide credentials for remote accesses to the specified system.

Configure a Password-less SSH Access from Linux/macOS to Linux

For remote collection on a Linux target system, set up the password-less mode on the local Linux or macOS host as follows:
  1. Generate the key with an empty passphrase:
    host> ssh-keygen -t rsa
  2. Copy the key to target system:
    host> ssh-copy-id
    user
    @
    target
    Alternatively, if you do not have
    ssh-copy-id
     on your host system, use the following command:
    host> cat .ssh/id_rsa.pub | ssh
    user
    @
    target
     'cat >> .ssh/authorized_keys'
  3. Verify that a password is not required anymore, for example:
    host> ssh
    user
    @
    target
     ls

Possible Issues

If the keys are copied but the
VTune
Profiler
 cannot connect to the remote system via SSH, make sure the permissions for
~/.ssh
 and home directories, as well as SSH daemon configuration, are set properly.
Permissions
Make sure your
~/.ssh
 and
~/.ssh/authorized_keys
 directory permissions are not too open. Use the following commands: 
chmod go-w ~/

chmod 700 ~/.ssh

chmod 600 ~/.ssh/authorized_keys
SSH Configuration
Check that the
/etc/ssh/sshd_config
 file is properly configured for the public key authentication.
For this step, you may need administrative privileges.
If present, make sure the following options are set to
yes
: 
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
For root remote connections, use: 
PermitRootLogin yes
If the configuration has changed, save the file and restart the SSH service with: 
sudo service ssh restart
sudo service sshd restart (on CentOS)

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.