vsh

Documentation

Overview

Command vsh runs the Vanadium shell, a Tunnel client that can be used to run shell commands or start an interactive shell on a remote tunneld server.

To open an interactive shell, use:

vsh <object name>

To run a shell command, use:

vsh <object name> <command to run>

The -L flag will forward connections from a local port to a remote address through the tunneld service. The flag value is localAddress,remoteAddress. E.g.

-L :14141,www.google.com:80

The -R flag will forward connections from a remote port on the tunneld service to a local address. The flag value is remoteAddress,localAddress. E.g.

-R :14141,www.google.com:80

vsh can't be used directly with tools like rsync because vanadium object names don't look like traditional hostnames, which rsync doesn't understand. For compatibility with such tools, vsh has a special feature that allows passing the vanadium object name via the VSH_NAME environment variable.

$ VSH_NAME=<object name> rsync -avh -e vsh /foo/* v23:/foo/

In this example, the "v23" host will be substituted with $VSH_NAME by vsh and rsync will work as expected.

Usage:

vsh [flags] <object name> [command]

<object name> is the Vanadium object name of the server to connect to.

[command] is the shell command and args to run, for non-interactive vsh.

The vsh flags are:

-L=[]
  Forward local to remote, format is "localAddress,remoteAddress". May be
  repeated.
-N=false
  Do not execute a shell.  Only do port forwarding.
-R=[]
  Forward remote to local, format is "remoteAddress,localAddress". May be
  repeated.
-T=false
  Disable pseudo-terminal allocation.
-local-protocol=tcp
  Local network protocol for port forwarding.
-remote-protocol=tcp
  Remote network protocol for port forwarding.
-t=false
  Force allocation of pseudo-terminal.

The global flags are:

-alsologtostderr=true
  log to standard error as well as files
-log_backtrace_at=:0
  when logging hits line file:N, emit a stack trace
-log_dir=
  if non-empty, write log files to this directory
-logtostderr=false
  log to standard error instead of files
-max_stack_buf_size=4292608
  max size in bytes of the buffer to use for logging stack traces
-metadata=<just specify -metadata to activate>
  Displays metadata for the program and exits.
-stderrthreshold=2
  logs at or above this threshold go to stderr
-time=false
  Dump timing information to stderr before exiting the program.
-v=0
  log level for V logs
-v23.credentials=
  directory to use for storing security credentials
-v23.i18n-catalogue=
  18n catalogue files to load, comma separated
-v23.namespace.root=[/(dev.v.io:r:vprod:service:mounttabled)@ns.dev.v.io:8101]
  local namespace root; can be repeated to provided multiple roots
-v23.proxy=
  object name of proxy service to use to export services across network
  boundaries
-v23.tcp.address=
  address to listen on
-v23.tcp.protocol=wsh
  protocol to listen with
-v23.vtrace.cache-size=1024
  The number of vtrace traces to store in memory.
-v23.vtrace.collect-regexp=
  Spans and annotations that match this regular expression will trigger trace
  collection.
-v23.vtrace.dump-on-shutdown=true
  If true, dump all stored traces on runtime shutdown.
-v23.vtrace.sample-rate=0
  Rate (from 0.0 to 1.0) to sample vtrace traces.
-v23.vtrace.v=0
  The verbosity level of the log messages to be captured in traces
-vmodule=
  comma-separated list of globpattern=N settings for filename-filtered logging
  (without the .go suffix).  E.g. foo/bar/baz.go is matched by patterns baz or
  *az or b* but not by bar/baz or baz.go or az or b.*
-vpath=
  comma-separated list of regexppattern=N settings for file pathname-filtered
  logging (without the .go suffix).  E.g. foo/bar/baz.go is matched by patterns
  foo/bar/baz or fo.*az or oo/ba or b.z but not by foo/bar/baz.go or fo*az