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Merge #16857: doc: Elaborate need to re-login on Debian-based after usermod for Tor group

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706340150f Elaborate on the need to re-login on Debian-based systems to use tor following usermod (clashicly)

Pull request description:

  Starting bitcoind with `-onlynet=onion` immediately after adding bitcoind user to debian-tor group will yield the following notice on debug.log:

  	"tor: Authentication cookie /run/tor/control.authcookie could not be opened (check permissions)"

  Elaborate on the need to re-login to ensure debian-tor group has been applied to bitcoind user after:

  	sudo usermod -a -G debian-tor username

  Verification can be done via `groups` command in shell.
  Otherwise operator may not be aware at first launch they are not running a tor enabled node.

ACKs for top commit:
  fanquake:
    ACK 706340150f - Thanks for following up.

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fanquake 2019-09-13 10:43:26 +08:00
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doc/tor.md
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@ -114,7 +114,10 @@ preconfigured and the creation of a hidden service is automatic. If permission p
are seen with `-debug=tor` they can be resolved by adding both the user running Tor and
the user running bitcoind to the same group and setting permissions appropriately. On
Debian-based systems the user running bitcoind can be added to the debian-tor group,
which has the appropriate permissions.
which has the appropriate permissions. Before starting bitcoind you will need to re-login
to allow debian-tor group to be applied. Otherwise you will see the following notice: "tor:
Authentication cookie /run/tor/control.authcookie could not be opened (check permissions)"
on debug.log.
An alternative authentication method is the use
of the `-torpassword=password` option. The `password` is the clear text form that