Loginusers mostrecent4/29/2023 This will still fetch all users from the DB but the Context will not be tracking these instances. you don't intend to update it so you don't need change tracking ) then use AsNoTracking(). If you fetch a significant amount of data and don't need that data to be tracked by the DbContext (I.e. Not because it still means extra round trips to the database despite that those instances are already tracked, but because the more instances that the EF DbContext is tracking, the more memory is in use and the longer it can take to fetch additional data since those operations will automatically look to associate any already tracked instances for any relationships for the data being returned. Loading entire sets of entities as tracked references is not a good idea. Do no confuse this with caching as being for a performance reason. Most of the time, this will get you the information you want.By default, EF will track references that it has already fetched. The only advantage you gain by using these logs is that the information comes directly from SSHD instead of via a secondhand source like the other methods. However, you're going to have to do a lot of parsing if you want to get this from a simple, human-readable log of events to a list of currently active sessions, and it still probably won't be an accurate list when you're done parsing, since the logs don't actually contain enough information to determine which sessions are still active - you're essentially just guessing. The logs show when sessions open and close, who the session belongs to, where the user is connecting from, and more. May 5 18:23:41 myhost sshd: pam_unix(sshd:session): session closed for user hendrenj May 5 14:27:09 myhost sshd: pam_unix(sshd:session): session opened for user hendrenj by (uid=0) May 1 16:16:13 myhost sshd: pam_unix(sshd:session): session closed for user hendrenj May 1 15:57:11 myhost sshd: pam_unix(sshd:session): session opened for user hendrenj by (uid=0) Here's a sample of what you might see: % grep hendrenj /var/log/sshd.log | grep session Your logs may be in these places or elsewhere. Some systems might output SSH logs to syslog. On an RHEL 7 box, and also on an Arch Linux box, I needed to use journalctl -u sshd to view the logs. On an RHEL 6 box, I found the logs in /var/log/sshd.log. Depending on your OS distribution, SSH distribution, configuration, and so on, your log output may be in a number of different places. You can infer this information by reading login information from utmp/ wtmp via a tool like last, w, or who like I've just described, or by using networking tools like described in their answer to find open tcp connections on port 22 (or wherever your SSH daemon(s) is/are listening).Ī third approach you could take is to parse the log output from the SSH daemon. I don't know of any way to explicitly show all SSH sessions. Furthermore, this approach won't show anybody who's logged in to an SFTP session, since SFTP sessions aren't shell login sessions. See Difference between pts and tty for a better description of the different values found in the TTY column. For instance, programs that create a pseudo-terminal device such as xterm or screen will show as pts. An SSH session will be on a pseudo-terminal slave ( pts) as shown in the TTY column, but not all pts connections are SSH sessions. These commands just show all login sessions on a terminal device. Who or w who -a for additional information.
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