If you get the following error:
VERIFY ERROR: depth=0, error=CRL has expired
it means that the Certificate Revocation List is expired and needs to be renewed. (Rationale). Here’s how you can do that.
Checking the expiration period:
openssl crl -in <strong>ca-crl.pem</strong> -text | grep 'Next Update'
To renew run:
openssl ca -gencrl -config ca.conf -out ca-crl.pem
To modify the interval change default_crl_days.
To fix the problem it’s sufficiet to modify the following parameter:
default_vsz_limit = 512M
On Centos 7 it’s located in:
/etc/dovecot/conf.d/10-master.conf
Not that hard to solve problem.
Note for future me:
apt-get install unattended-upgrades update-notifier-common ; dpkg-reconfigure unattended-upgrades
I think it might be the same for Ubuntu.
This is how you can use curl with cookies:
curl --cookie cookies.txt --cookie-jar newcookies.txt https://yahoo.com -I
Sometimes it could be required to test a website with cookies from curl.
find $DIR -type f -printf "%T@ %p\n" | sort -n | cut -d' ' -f 2- | tail -n 1
Found at StackOverflow.
Simply run:
apt-get install memtest86+
It will install memtest and reconfigure the menu.
It’s pretty easy:
apt install libipc-run-perl
apt-get install vlan
modprobe 8021q
grep -q 8021q /etc/modules || echo 8021q >> /etc/modules
vim /etc/network/interfaces
auto eth0.99
iface eth0.99 inet static
address 192.168.99.1
netmask 255.255.255.0
vlan-raw-device eth0
ifup eth0.99
For some reason vim on Debian went crazy and stopped worked as vim. This is how to make it work like vim instead of vi.
cp /usr/share/vim/vim74/vimrc_example.vim ~/.vimrc
and change
" In many terminal emulators the mouse works just fine, thus enable it.
if has('mouse')
set mouse=a
endif
to
" In many terminal emulators the mouse works just fine, thus enable it.
if has('mouse')
set mouse=r
endif
Hooray.
Some host providers block all email ports (like TCP/25 and TCP/587). Here’s simple of example of how to setup two STMP servers, where SMTP1 is a relay server (forwarder), and SMTP2 uses SMTP1 to send email. Both are using default configuration files with slight changes.
SMTP1 (smart host)
This config line allows SMTP2 to send email without SMTP authorization. For the sake of security it would make sense to restrict access to port 2525 using iptabes.
mynetworks = 127.0.0.1 <IP_of_SMTP2>
This goes to /etc/postfix/main.cf.
And the following
2525 inet n - n - - smtpd
goes to /etc/postfix/master.cf on SMTP1. So that Postfix opens TCP port 2525.
SMTP2
Add this to /etc/postfix/main.cf on SMTP2.
smtp_always_send_ehlo = yes<br />relayhost = 199.101.134.4:2527<br /><br />
After restart you should be able to send emails from SMTP2 via SMTP1‘s using port 2525.