Just a small note for this oneliner to cleanup snapshots
First list all snapshots with a given pattern.
(This eaxmple searches 12m)
zfs list -t snapshot | grep -F '12m' | cut -d " " -f 1 | xargs -L 1 echo zfs destroy
Remove the word echo to perform a cleanup
zfs list -t snapshot | grep -F '12m' | cut -d " " -f 1 | xargs -L 1 zfs destroy
zfs list -t snapshot
List all zfs snaphots
grep -F '12m'
Only match the lines containing the string 12m
cut -d " " -f 1
Only fetch the first column of the output. (This is the snapshot name)
xargs -L 1 zfs destroy
Execute the command ‘zfs destroy’ for the found lines
The option -L 1 means it calls ‘zfs destroy’ per item
without it, xargs wills supply multiple items to 1 call. (Which isn’t support by zfs destroy)
Today I tried to install FreeBSD 11.0
FreeBSD booted from the USB stick. When mounting the install image I received error:
Mounting from ufs:/dev/ufs/FreeBSD_Install failed with error 19.
I couldn’t figure out why I constantly got this error.
After tweaking bios etc. Using an USB2 port I finally gave up an though my USB stick was broken..
But then creating the second stick I found the problem.
The first time I created my memory stick like this on Mac OS X
sudo dd if="FreeBSD-11.0-RELEASE-amd64-memstick.img" of="/dev/disk2s1" bs="10240"
Look at the wrong /dev/disk2s1 path.. (that’s wrong!! )
The second attempt I used the following command. (I needed tot unmount /dev/disk2s1 in DiskUtilty first
sudo dd if="FreeBSD-11.0-RELEASE-amd64-memstick.img" of=/dev/disk2 bs=1m conv=sync
Now it works :D
Today I had an issue that I needed to resend quarantined emails.
You can simply execute the following command to inject the mails to postfix
sendmail -t < name_of_the_raw_email_file
Thanks Wietse (Author of Postfix)
I totally agree: https://davidcel.is/posts/stop-validating-email-addresses-with-regex/
validates :email, format: /@/i, allow_blank: true
I prefer this one:
validates :email, format: /.+@.+\..+/i, allow_blank: true
More then enough!
I didn’t know this trick:
This blog entry describes how to use your normal SSH connection as a SOCKS proxy for web requests.
Just connect to the SSH server with the -D option on port 8080
ssh -D 8080 -p [port number] [username]@[IP address or hostname]
On Mac OS X just enable the socks proxy in the Advanced tab of your network/wifi card:
And enter as SOCKS proxy server 127.0.0.1, on port 8080
But for a full vpn attempt over SSH, maybe I should look at this: