Newest Questions

Q&A for system and network administrators

Mysql/Mariadb backup from non-bootable system

My working server crashed, more precise, my HDD got bad sectors. What is proper method to make a backup from non-working server and restore it later on newly installed server? Any set of files I need ...

Grails app with tomcat - unable to access given static file

Recently we've noticed some very bizarre things happening with our Grails application. Our web server is running Tomcat 7 on Ubuntu 14.04 LTS. We started noticed that rebooting the instances is ...

Configuring software on multiple computers [on hold]

Hey guys im trying to do things the right way and save as much time as possible (like a professional would). When a company has many many computers you first create a computer with everything ...

Postfix and LDAP error

I've been trying to set up a mail server with Dovecot, Postfix and a LDAP backend. Postfix is using bind to connect with LDAP and Dovecot isn't (at the moment it is using the admin account as the DN). ...

Change Kerio Control's interface IP via shell

We are using Kerio Control Software Appliance in the datacenter. Recently, the IP that our external interface was bound to became unavailable and datacenter has issued us another IP. Since Kerio ...

Just created a simple postgres db using AWS RDS. However, I'm not able to connect to it unless I provide My IP in my security group inbound

I just created a simple postgres database. It gave me a link that I could use to connect to it, so I tried connecting using pgadmin but it gives a timed out error. So, I read the documentation again ...

sweep command running in postfix mail server

I have installed postfix with amavis on Redhat. Also, I have configured AV scanner as well in amavis to counter mail viruses. Whenever I see top command result, I find a lot of instances of sweep ...

Migrating email from old server without domain name with imapsync

Here is the problem : My client moved to another server, and they have changed domain name servers already. Old server is still active. Problem is that I have to migrate massive amount of email ...

getting apache2 to log php errors in required files

I've spent way too long finding errors in some files because apache2 isn't logging errors in a way I thought it should. I have my vhost configured to have its error log going to /var/www/mysite.com/...

Getting error 12206 “Proxy chain loop” when connecting to an IP from local subnet

Config: TMG is up at 10.0.3.1 with three network adapters, one of them is connected to Internet. Local Windows 8.1 PC at 10.0.3.xx attempts to connect to a managed switch (internal) at http://10.0.3....

Why when I load the ddns domain associated with the public IP of my huawey b310 router does this reject the connection? [on hold]

¡Important, "~~~~://" means "http://"! I have the following domain hired at ~~~~://www.dynu.com: ~~~~://medaeditorbyuknown1.dynu.net/ The domain is associated with the IP of the router thanks to ...

bind9 not responding to DNS requests

I am trying to setup a basic DNS server that just forwards requests from other DNS servers. I've installed bind9 and edited the /etc/bind/named.conf.options file as below. options { directory "/...

How docker manage volumes when scaling up compose project?

What if have 10 instance of any container which needs presistant storage, so on 10 instance how docker will manage volume for them, i've defined volume in docker-compose.yml i didn't find anything ...

Is Azure Point-To-Site VPN secure enough to use for 3rd party access?

I need to give some customers access to my server(Azure VM) via either FTP or SQL (they want to retrieve files via FTP and want to connect to a special database), no remote desktop. Currently I'm ...

Apache - mod_perl : Unknown Authz provider 'access'

I am trying to set up and run an old Web application(written in 2010) in a new Linux environment. The Apache server is not starting because of the error Unknown Authz provider access, caused by the ...

Access to AWS console for third party using cross-account?

There are two companies: Client and Contractor. Both have AWS accounts. I'm looking for simple but secure way to get staff from contractor team access to client's AWS console. Yep, I'm on the ...

using local storage with cloud VM [on hold]

I'm trying to figure out how I can run my app through a cloud VM, and still maintain a local storage. For example, customer is ok with using cloud services as long as the files are stored in a NAS or ...

GCP configure an external master issue

I'm following GCP tutorial to create a replica instance from an external master. The Cloud SQL API is enabled and I am using google shell from the console to run the commands. I have also tried from a ...

Cisco RV325 - Error Policy Violation in Log

We are seeing new error logs when clients are trying to connect to our Cisco RV325 router. 2017-02-22, 06:09:30 Connection Refused - Policy violation IN=eth0 OUT=eth1 SRC=192.168.2.190 DST=72....

Advantage on using dual NICs for streaming [on hold]

I currently have a 20/5 mbps connection. If I use 2 separate NICs 1 dedicated to streaming (OBS allows you to bind to a NIC) and a second one for gaming connected to the same network would I see any ...

What's wrong with my Racoon configuration?

I made the racoon configuration in this topology And I set up the racoon of the left server and the right server.Left server /etc/racoon/racoon.conf configuration: remote 1001::2 { exchange_mode ...

Should File Server / 3rd Party Softwares / IIS be installed on separate VMs?

Im preparing for my mcsa 70-410 + Managing our new server (win Srv 2012 R2) We are a network of 125 users. I wanted to Know if it would be alright to host File server + IIS roles and install 3rd ...

What's the priority of kernel bad block log?

We are considering transferring the following kernel bad block log to the syslog server. Could you tell me the priority of the kernel bad block? Currently the setting in /etc/syslog.conf, kernel is ...

Trillium Director is not getting up in MDM.Can anyone suggest [on hold]

I am from MDM Tibco team. We are just finished with Unix security patching and now we have restarted MDM Server and we are getting Trillium issue. Trillium Director is not getting up in MDM.Can anyone ...

Win32-OpenSSH - random error message (error in libcrypto)

I have a landscape as below: SFTP server with OpenSSH, a client PC to connect to it using public key. After connection is made, it will execute some scripts for business purposes. The connection is, ...

Set Nagios to alert if a threshold is exceeded over time?

I have a server with a memory value that I want to monitor. If the value is over a certain amount over the course of an hour, I'd like to have an alert sent, but until then I'd like to have it ignore ...

How can I ensure varnish always has a child process running?

Now and again I encounter a problem on a varnish box which results in varnish's child process dying. It usually looks something along the lines of: Feb 26 17:09:45 webstar varnishd[9775]: Child (...

How to install PHP 7.* on Debian 8.7?

I am looking to install at least PHP 7.0 on Debian 8.7 but from searching around I am finding it hard to find a reliable source that shows me how to do it. It seems so difficult, I have come across ...

MTA (postfix) failing on one domain relay of a dual domain config

I want MTA to send emails from 2 domains, issues by same server. eEmail is sending from one domain, but failing from the other. My app server generates smtp email as either mydomain.com or ...

Batch renaming folders in a directory [on hold]

I'm writing a script in powershell to organize media files in a directory and wrote this code to rename folders in the main directory "Season #". $i = 1 Get-ChildItem | ?{ $.PSIsContainer } | Rename-...

Nginx (1.11.10 / 1.10.0) ReverseProxy Error: timeout upstream timed out (110: Connection timed out) while connecting to upstream

I'am trying to configure nginx to work as a reverse proxy for my Asp.Net Core and nodejs Projects. I'am new to configurating a webserver, so please be kind :-D I followed the tutorial from Scot ...

Authentication of Linux machines over the internet in a Windows only shop

Our company is a Windows shop with Windows Active Directory deployed full time. We have a mix of Windows 7 and Windows 10 machines. I understand authentication of Linux machines when I am inside the ...

Is it possible to completely hide website's IP from everybody including the website's users?

There is a good article on how to protect your origin IP in https://blog.cloudflare.com/ddos-prevention-protecting-the-origin. All is good and clear on that page except when it comes to mail server, ...

Change netmask in openvpn

I have an openvpn with netmask /27 but I need more addrrsses for clients, the question is how can I do it? Can I change netmask on my openvpn server config to /26 or I have to rebuild openvpn server?

Unable to create iqn at targetcli?

I want to make a san on my virtual machines, I have already configured a server1 as Server target with theses steps: - create lvm on server1 - install targetcli - create blocks - create iqn using: ...

Doesn't work chroot with ftp from other directory

i have mixture php-fpm7.1 + chroot + nginx. I have an ftp directory alias (like mysite.com/ftp) I need make chroot with php-fpm in "/ftp" "/ftp" it is net2ftp client, that connected to our server The ...

MegaCli reports an inconsistent number of physical disks

First, here's the abridged version of my question. I have a blinking red light on a drive in a RAID array and although MegaCli doesn't report any disk failures or warnings, some MegaCli commands show ...

bind9 reverse resolution not working

My forward resolution works and the reverse resolution fails, unable to figure out the problem. I appreciate if someone point the configuration error. Here you go for some files and output dinesh@...

Why is terraform erring with 'SignatureDoesNotMatch: Signature expired'?

I started getting the following when running terraform commands: $ terraform refresh Error refreshing state: 1 error(s) occurred: * SignatureDoesNotMatch: Signature expired: 20170226T035111Z is now ...

Trailing slashes with nginx and shiny server

Trying to get Shiny apps to load without using trailing slashes. Here is my sites-enabled server { listen 80 default_server; listen [::]:80 default_server; root /var/www/html; index ...

How does XMPP support offline messages [on hold]

I send 100+ DM to someone who is offline. When the receiver comes online, he has 0 emails arrived. How does send-receive work in XMPP? Is it more related to used client or protocol itself?

How do you perform a dump of a Neo4j database within a Docker container?

A docker container for Neo4j is started as per the documentation and working properly using the following command: $ docker run \ --detach \ --publish=7474:7474 \ --publish=7473:7473 \ ...

How do I extract potential passwords from an archive of my facebook conversations [on hold]

What is the best way to scan for username/passwords that were exchanged via facebook messenger? I have the file containing chat the entire chat hitory.

Install Microsoft Dynamics CRM 2016 with IFD and ADFS on the same server using port 443

I'm trying to install Microsoft Dynamics CRM 2016 with IFD (Internet-Facing Deployment) and ADFS on the same server (Windows Server 2012 R2) ADFS is running and seems to be working fine. I can fetch ...

Serving specific remote path if remote path does not exists via proxy_pass

I've been troubleshooting this for almost half a day now. :( On the Nginx running on my laptop where I don't use proxy_pass, the try files is working great. The Javascript web app I wrote does client ...

How can I automatically hibernate cloud servers?

I have been directed to post here for guidance from askubuntu. I have cloud data centers running Ubuntu 16.04 lts and NextCloud that have no need to be available 24/7, and need power management ...

Gap in Waterfall Loadtime test

When I test my wordpress websites with GTmetrix oder other Loadtime Testing tools I notice a gap in the Waterfall graph where no action is taking place. It looks like the time this gap is lost which ...

questions to tag volumes by salt, either state or module?

How salt can tag ec2 ebs volumes? I have tried all different ways I could think of, but non of them working: First, tag volumes in profile: block_device_mappings: - DeviceName: /dev/sdb ...

How to migrate SVN to new server in phased approach

I'm currently migrating my dev services (VCS, CI, CD etc) to a new environment; part of this involves moving our SVN server. I've been able to set up the new SVN server (CollabNet Subversion) and copy ...

What does ConnectTimeout in ssh_config mean?

Local and remote os are all debian8. I want to keep ssh alive for long time. The configuration file /etc/ssh/ssh_config on my client(local) side. Host * ServerAliveInterval 60 ...
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