When you host a web site, many web hosting providers allow your web site access using multiple urls like yourdomain.com, www.yourdomain.com. If you have a dedicated IP address, your web site become available on the IP address also. It is bad for SEO to have a site available in multiple URLs. If search engine index […]
Sent maldet scan report to email
After running a scan, maldet will give you command to see result like
|
1 |
maldet --report SCAN_ID |
If you need this email sent to your email, use command
|
1 |
maldet --report SCAN_ID EMAIL_ADDR |
Example See maldet […]
gsettings
Ubuntu Screen Recorder […]
Install Preview Generator in Nextcloud
To enable preview for files in nextcloud, you need to install “Preview Generator” from next cloud app store https://apps.nextcloud.com/apps/previewgenerator To install login to nextcloud as admin. From right drop down menu, click + Apps link. Once on Apps page, you can use the search button on right side to search for “Preview Generator” and install […]
Enable SEO url in nextcloud
To enable SEO url in next cloud, first make sure your web server have mod_rewrite module enabled. Edit config.php file
|
1 |
vi config/config.php |
add following
|
1 2 |
'overwrite.cli.url' => 'https://yourdomain.com/', 'htaccess.RewriteBase' => '/', |
overwrite.cli.url may already there, in that case, don’t add it again. Now run
|
1 |
sudo -u www-data php /var/www/nextcloud/occ maintenance:update:htaccess |
See NextCloud […]
csf error path to iptables is either not set or incorrect
Whem install csf firewall on Ubuntu 20.04, i get following error
|
1 2 3 4 5 |
root@ok:~# csf *Error* The path to iptables is either not set or incorrect for IPTABLES [/usr/sbin/ip6tables] in /etc/csf/csf.conf at /usr/local/csf/lib/ConfigServer/URLGet.pm line 26. Compilation failed in require at /usr/sbin/csf line 21. BEGIN failed--compilation aborted at /usr/sbin/csf line 21. root@ok:~# |
This is because path for iptables is changed in Ubuntu 20.04. To fix the error edit csf.conf
|
1 |
vi /etc/csf/csf.conf |
Find
|
1 2 3 4 5 6 |
IPTABLES = "/sbin/iptables" IPTABLES_SAVE = "/sbin/iptables-save" IPTABLES_RESTORE = "/sbin/iptables-restore" IP6TABLES = "/sbin/ip6tables" IP6TABLES_SAVE = "/sbin/ip6tables-save" IP6TABLES_RESTORE = "/sbin/ip6tables-restore" |
Replace with
|
1 2 3 4 5 6 |
IPTABLES = "/usr/sbin/iptables" IPTABLES_SAVE = "/usr/sbin/iptables-save" IPTABLES_RESTORE = "/usr/sbin/iptables-restore" IP6TABLES = "/usr/sbin/ip6tables" IP6TABLES_SAVE = "/usr/sbin/ip6tables-save" IP6TABLES_RESTORE = "/usr/sbin/ip6tables-restore" |
Now restart csf with csf -r, it will work.
|
1 2 |
csf -r systemctl restart lfd |
See csf […]
Change Email address of LetsEncrypt SSL
To change email address of LetsEncrypt SSL certficate account, run
|
1 |
certbot update_account --email you@your-domain.com |
See LetsEncrypt […]
View SSL certficate Details
To view certificate details
|
1 |
openssl x509 -text -noout -in SSL_FILE.crt |
For web server
|
1 |
openssl s_client -showcerts -connect serverok.in:443 |
IMAP via SSL
|
1 |
openssl s_client -showcerts -connect mail.yourdomain.com:993 -servername mail.yourdomain.com |
POP3 via SSL
|
1 |
openssl s_client -showcerts -connect mail.example.com:995 -servername mail.yourdomain.com |
SMTP via SSL
|
1 |
openssl s_client -showcerts -connect mail.yourdomain.com:465 -servername mail.yourdomain.com |
SMTP via TLS/StartTLS
|
1 |
openssl s_client -starttls smtp -showcerts -connect mail.yourdomain.com:25 -servername mail.yourdomain.com |
See SSL […]
Linux User
Lock User Account in Linux usermod […]
Disable systemd-resolved on Ubuntu/Deb/CentOS
systemd-resolved provide DNS resolver facility in newer version of Linux servers running systemd. I prefer manually editing /etc/resolv.conf and add resolvers. If you are running your own DNS server, then you need to disable systemd-resolved as it listen on port 53, with out disabling the service, you can’t start your DNS server. To disable systemd-resolved, […]