TCP/IP: no SYN/ACK response from dedicated ‘OVH kimsufi’ server after client sending SYN for port 873 (rsyncd)

 From the client debian 9 (IP 2.2.2.2 for example) : Chain OUTPUT (policy ACCEPT) target prot opt source destination test rsync or telnet doesn’t access remote socket (*not dropped by kernel** ¹): # telnet 1.1.1.1 873 Trying 1.1.1.1… If I test another ports, like 80, 443 or ssh, all is working well ! tcptraceroute 1.1.1.1 873…

How to add additional email validation rules by a python/perl script in Postfix?

In main.cf I have multiple restrictions, as usually: smtpd_NNN_restrictions = # ….. # ….. I want to be able to use an additional python/perl script in each section to make the final decision of whether or not reject or pass an email. Namely, even though, say this triggers an email to get rejected: reject_rbl_client bl.spamcop.net,…

Access Denied using S3 upload function

I have a lambda function with the following policy { “Version”: “2012-10-17”, “Statement”: [ { “Action”: [ “s3:ListBucket” ], “Resource”: [ “arn:aws:s3:::my-bucket” ], “Effect”: “Allow” }, { “Action”: [ “s3:GetObject”, “s3:PutObject”, “s3:DeleteObject” ], “Resource”: [ “arn:aws:s3:::my-bucket/*” ], “Effect”: “Allow” } ] } I am calling the listObjectsV2 without problem but when I want to call…

docker – volumes vs mount binds. what are the use cases?

After reading and playing around with docker for a short while, I am considering using it in my production environment. However I am still trying to understand the difference between mount binds and volumes. According to Dockers documentation on mount binds (https://docs.docker.com/storage/bind-mounts/): Bind mounts have been around since the early days of Docker. Bind mounts…

Passing environment variables to httpd in centos 7

In my previous Centos 6.10 server , I have been able to pass some environment variables to httpd by adding to /etc/sysconfig/httpd . ~/.envvars .envvars content is export MY_PASSWORD=’somepassword’ and then in http.conf SetEnv MY_PASSWORD ${MY_PASSWORD} and easily accessing the variable in php trough $_SERVER[‘MY_PASSWORD’] but after upgrading to Centos 7.7 this stopped working, in…