Latest Server related questions

Score: 0
Error on postfix: Temporary lookup failure
ng flag

I have an error with my postfix installation. Here is the error:

NOQUEUE: reject: RCPT from sender11-of-o52.zoho.eu[31.186.226.238]: 451 4.3.0 <[email protected]>: Temporary lookup failure; from=<[email protected]> to=<[email protected]>

Here is my main.cf:

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

smtpd_banner = $myhostname ESMTP
biff = ...
Score: 0
Jeff avatar
Is it possible to improve shared-cpu-vps hosting performance with a keep-alive? Or something else?
dj flag

Taking the leap from dedicated to shared-cpu-vps and have just one major concern: I will no longer have a dedicated CPU.

In past tries with vps hosting, I've noticed my servers sometimes don't respond for a second or two, even though the dc is only a hundred miles away. That's unacceptable for my use-cases, so I need to ask if the behavior can be mitigated.

Is it possible to minimize the potential " ...

Score: 0
BySpecops. avatar
How to "Let's Encrypt" Wildcard SSL certificate on Multiple Servers?
de flag

How can I configure WildCard SSL Certificate with certbot and copy the same certificate to other servers as well? I'm trying to run a secured Nodejs (Expressjs) application.

Currently, I'm able to do that by creating separate certificates for every subdomain but since I'm moving to Terraform, I can't do it in that way due to subdomain records will be created after the instance resource.

Score: 0
Changing an A record
de flag

I'm new at this and want to make sure I'm understanding A records completely. If I change the A record for my domain name, traffic for that domain name will be redirected to the new IP address, correct? We have a Google hosted domain and a ShowIt website. We are building a landing page on MailChimp. MailChimp's instructions say to change our domain A records and CNAME. If I follow these directions, then ...

Score: 0
QF0 avatar
Configuring sendmail to listen on an alternative port
gu flag
QF0

I've set up sendmail to listen on port 1234 rather than 25 with one change to sendmail.mc:

DAEMON_OPTIONS(`Port=1234, Name=MTA')

This generally works, with one exception. The background is that I have a relay listening on port 25 (the relay must have an MX record, so it must be on port 25). The relay sends on mails via sendmail, so sendmail listens on localhost:1234. In other words, sendmail is only re ...

Score: 1
viniciuskneves avatar
Safely store AWS IAM User Keys (Access and Secret) created by IaC
de flag

I've the following setup:

  1. Infrastructure is setup using AWS CDK;
  2. I've one Stack/Environment (Production, Staging...);
  3. Each Stack has a different S3 Bucket (used for website hosting);
  4. I've a Stack that creates an IAM User (used by CI/CD);
  5. CI/CD in this case is GitHub Actions (deploy every time a merge to main happens);
  6. The IAM User has only put rights to all the Buckets (deploy means put the assets in t ...
Score: 1
How to find installation of apache
ru flag

I have a server running Ubuntu 20.04.3 LTS (Focal Fossa). It is at IP address 192.168.1.12

When I use a web browser to access 192.168.1.12, a NextCloud login appears. This is all well and good except that I have not (purposely) installed NextCloud. When I connect to port 80 using telnet:

When I connect to the server via telnet on port 80 for more information:

> telnet 192.168.1.12 80
Trying 192.168 ...
Score: 0
What happens when the token under an android profile in InTune expires?
cn flag

Using the Coreporate-owned dedicated devices enrollment profile we created a profile and enrolled devices using it. Now we come back to add more devices and the profile and token have expired. What happens to all the devices associated with this profile? Do they need to be re-enrolled?

Score: 0
Alessandro Campolo avatar
Samba file lock prevents media unmount
pk flag

I have a small server with a samba share that sometimes I use to share removable disks connected in the hot swap bays. After mounting a disk and accessing it, I try to unmount it, but umount refuses (even using -f) to do it because the disk is busy: umount: /share/external: target is busy..

lsof reports:

smbd      62850                                root  cwd       DIR               8,65       4096    ...
Score: 0
Danil avatar
Link docker container to a specific network interface
dz flag

I am trying to start OpenVPN server for accessing resources on VPC network.

I have two network interfaces, public eth0 and VPC eth1. And an OpenVPN working in a docker container. But I want to use this VPN only to access resources over eth1 interface. And make it impossible to access internet over that VPN. So I want to map OpenVPN inbound port 1194/udp to eth0 in order to access VPN server. And  ...

Score: -2
Ricardo Silva avatar
Why an operating system would like to be POSIX compliant?
de flag

What's the big deal around POSIX and how it interferes in the overall usage of an Operating System?

Score: 0
sendmail and pacemaker require different /etc/hosts
in flag

Trying to make run sendmail (required by fail2ban, or it takes forever to start-stop-restart it) and pacemaker on one machine.

Sendmail wants machine's hostname resolved as 127.0.0.1, pacemaker - as 192.168.100.1, otherwise they both don't work correctly. Can't figure out, how to achieve this in /etc/hosts, or it is simpler to use postfix? or remove mail notifications in fail2ban?

Score: 0
King David avatar
hdfs + why not remove the corrupted blocks by automatic approach as cron job
gb flag

we have Hadoop cluster with 376 data-node machines ( based on HDP version - 2.6.4 )

from time to time we can see XX number of corrupted blocks

and to fix it we are performing the following:

su hdfs
hdfs fsck / -delete

since this happened from time to time

we are thinking to perform the hdfs fsck / -delete by Cron job , for example cron job can run every 00:00 , and delete the corrupted blocks

but ...

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