Debian / Ubuntu prefer to use IPv6 DNS Records. This leads to problems if the server supports only IPv4. The problem can easily solved. We only need to change the config for getaddrinfo(). Open /etc/gai.conf and change #precedence ::ffff:0:0/96 100 to precedence ::ffff:0:0/96 100 For me it was line 54.
The script wp-spamreport.php (as a download here in my git) reports at any time the spam comments of the last 48 hours to blocklist.de. It does not matter when a comment was marked as spam (manually or automatically by example Antispam Bee), but only that the comments are posted in […]
I use SPF records for many years. My implementation of SPF records in ISPConfig occurred to me to point out the advantages again. SPF is an authentication method that is stored in the DNS. This entry specifies which server can send mail for a particular domain. And why do I […]
The configuration directory / etc should be versioned for documentary reasons and for backup. All changes are visible at a glance and a previous state can be restored easily. In / etc are also security-related information. Therefore, care should be taken when transferring and backup the repository on encrypting and […]
To transfer the ownership of files in a directory recursively from a user / group to another, you can use this simple one-liner: find . -user old_user -group old_group -print0 | xargs -0 chown -v -h new_user:new_group I have found it here. There also the individual parameters are explained in […]
To secure replication over ssl, mysql must support ssl. mysql -u root -p show variables like ‘%ssl%’; If the result looks like this ssl is not configured yet. have_openssl DISABLED have_ssl DISABLED ssl_ca ssl_capath ssl_cert ssl_cipher ssl_key First, the directory for the ssl-keystore is created on both servers. mkdir -p […]
I use on my servers ISPConfig, for IMAP and POP3 Dovecot is used. With Dovecot 2.x, the mails can also keep in sync between two servers. The replication is done via the Dovecot index files. So neither an error in the file system nor an accidentally deleted Maildir have a […]
With less text files are displayed. But you can also search in files. By pressing /named to get to the first occurrence of named. A reverse search works with ?named. Press n to jump to the next occurrence. In order not to have to press n again and again, a […]