Postfix a way to limit the frequency of brute force?
In file /usr/local/etc/postfix/main.cf place something like the following:
Code:
...
# RATE THROTTLING
smtpd_client_connection_rate_limit = 20
smtpd_error_sleep_time = 10s
smtpd_soft_error_limit = 3
smtpd_hard_error_limit = 5
...
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Category: Linux
Diplaying Logs with journalctl [CentOS7]
To simply view the logs on your system, you can execute the following command:
journalctl
This will display the logs with the oldest entries first. Although this is simple, it is not very useful since we do not tend to read logs like a book.
By default journalctl displays the logs in a pager. It shows you one page of logs requiring you to hit the space bar to proceed.
Diplaying Logs by Date Read More
Postfix mail statistics
Simple statistic every day
I tested on CentOS 7. Install pflogsumm that is Postfix mail log reporting tool. We run:
sudo yum install postfix-perl-scripts
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How to Upgrade Payara Server
The answer to the question of “how do I upgrade?” is always “it depends”, because everyone’s situation is going to be slightly different. This blog will cover some of the most straightforward ways which should apply in the majority of cases.
Either of the following two methods would work in most circumstances:
Backing up and restoring the existing configuration to a new installation
Maintaining completely separate domain and node directories and pointing the new version to the existing directories Read More
Posfix making sense of delays in mail
The maillog is easy enough to follow, but when you understand what all the delay and delays numbers mean then this may help really understand what is going on!
A standard email entry in postfix looks like:
Jan 10 10:00:00 testmtr postfix/smtp[20123]: 34A1B160852B: to=, relay=mx1.example.lan[1.2.3.4]:25, delay=0.49, delays=0.2/0/0.04/0.25, dsn=2.0.0, status=sent
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How to find expiry date of SSL certificate [linux]
How to easily check whether the certificate has expired or not.
My bash command
You can use, all dates (creating and expiring):
openssl x509 -enddate -noout -in /etc/pki/tls/certs/localhost.crt
Install ruTorrent on xbian
Install and configure apache server:
sudo apt-get install apache2 apache2-utils libapache2-mod-php5
Configure Apache
Enable auth_digest module for ruTorrent authentication, SSL, and reqtimeout.
sudo a2enmod auth_digest ssl reqtimeout
Open apache2.conf
sudo nano /etc/apache2/apache2.conf
Edit or add the following lines:
Timeout 30 ServerSignature Off ServerTokens Prod
Install Transmission torrent client on Xbian
We will install torrent client called Transmission. Before we do that lets update and upgrade our packages.
sudo apt-get update
sudo apt-get upgrade
After, installing the client:
sudo apt-get install transmission-daemon Read More
If you nead, automated certificate expiration checks on CentOS Linux
One important part of using SSL is to keep track of expiration dates on certificates. Most client software will rightfully refuse to connect to a server that presents an expired certificate, resulting in interrupted services. For CentOS and other RHEL based distributions, the crypto-utils package contains a very useful utility called certwatch, which can be used to detect whether a certificate will expire in the near future. Read More
Yum Timeout Slow Connection
For this particular situation the ISP (will rename un-named) had burstable-bandwidth. However, that became an issue when attempting to do a yum update. Here’s the workaround that let us download the updates no matter what the bandwidth was:
nano /etc/yum.conf