tramp: Connection caching
4.13 Reusing connection related information
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For faster initial connection times, TRAMP stores previous connection
properties in a file specified by the variable
‘tramp-persistency-file-name’.
The default file name for ‘tramp-persistency-file-name’ is:
‘~/.emacs.d/tramp’.
TRAMP reads this file during Emacs startup, and writes to it when
exiting Emacs. Delete this file for TRAMP to recreate a new one on next
Emacs startup.
Set ‘tramp-persistency-file-name’ to ‘nil’ to disable storing
connections persistently.
To reuse connection information from the persistent list, TRAMP needs
to uniquely identify every host. However in some cases, two different
connections may result in the same persistent information. For example,
connecting to a host using ‘ssh’ and connecting to the same host through
‘sshd’ on port 3001. Both access methods result in nearly identical
persistent specifications ‘/ssh:localhost:’ and ‘/ssh:localhost#3001:’.
Changing host names could avoid duplicates. One way is to add a
‘Host’ section in ‘~/.ssh/config’ (
Frequently Asked Questions).
Another way is to apply multiple hops (Multi-hops).
When TRAMP detects a change in the operating system version in a
remote host (via the command ‘uname -sr’), it flushes all connection
related information for that host and creates a new entry.
Info Catalog
tramp: Password handling
tramp: Configuration
tramp: Predefined connection information