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Q&A for system and network administrators

Using chef, how do I ensure a server is provisioned before a client depending on the server?

I am deploying a distributed service which uses an NFS share across a handful nodes. In this scenario, there is a master node which exports an NFS share and a number of slave nodes which must mount ...

Terraform - Use nested loops with count

I am trying to use a nested loop in terraform. I have two list variables list_of_allowed_accounts and list_of_images, and looking to iterate over list list_of_images and then iterate over list ...

Cassandra ReadTimeout: code=1200 - Coordinator node timed out waiting for replica nodes

I've got 3 node cluster on DSE 4.8.8 with replication factor = 2 and consistency on write quorum and on read one. When I'm trying to select some of the data I get this error: cqlsh:production> SELECT ...

Debian DHCPv6 get static configured IPv6

I configured the DHCPv6 server to return a fixed IPv6 for a specific DUID, how can I get this IP on a Debian client? If I release the current lease with dhclient -6 -r the current DUID is lost and ...

VMDK file size much larger than allocated

I have a bunch of disks attached to a virtual machine that hosts backups for other servers around our client networks. I was looking at datastore usage recently and found that all of the disks are ...

Windows update _only_ once a week?

I want Windows Updates to only be installed on Saturday night between 11pm and 2am. I do not want it to install Windows updates whenever it wants to. I have a Powershell script that uses the ...

apache rewrite and PHP's variable REQUEST_URI

I have an issue with Apache passing to the PHP $_SERVER[‘REQUEST_URI’] variable the URL after it has been rewritten rather than the original one requested. I am doing this rewriting because I had a ...

Servers randomly stop communication with other servers

This is now happening more frequently than I imagined. I have two servers in same location directly connected to ISP, on static provider's IPs. Servers constantly communicate with remote server ...

Giving permmisions to Virtual Service Accounts on domain controllers

The service I'm implementing will run on a domain controller, so I'd like it to have minimal privileges. Ideally, it would simply run as Local Service. However, it needs to be able to: monitor ...

Optimize application to handle huge spikes

Our application is growing fast so now we need to scale the infrastructure to don't slow down the entire website independently on how many users we have The backend system is based on many curl calls ...

Marathon, Rancher, Nomad, Which solution is the best for me? [on hold]

I would like to do a big test on Marathon, Rancher, Nomad ans Swarm to determine which is the best solution for orchestration of Docker for a school project. So i need help to get a list of what it's ...

Rsync cron works but monit cron doesn't

I run a 14.04 Ubuntu server. I'd like to automatically receive Monit email alerts. Typing /usr/bin/monitcron.sh as root all works fine manually. I tried cron with Rsync as a test. Cron works great. ...

SQL Server Error 40 - Could Not Open A Connection

I have a point of sale system installed on a virtual machine on my LAN. The point of sale software references a SQL Server installed on the same virtual machine (localhost). Using this system that ...

Need to force specified User to change password at next logon via powershell

Is there any Script or Command to enforce specified user change his passoword next logon via PowerShell ? Please Explain Step by step. Tnx :) .

Where does the bash PATH on CentOS 7 get /usr/local/bin from?

I've just spun up a brand new CentOS 7 VM (bash version 4.2.46) with Vagrant using the centos/7 box, and when I'm logged in as the vagrant user, this is my PATH: /usr/local/bin:/usr/bin:/usr/local/...

Running Gitlab and Openproject on one server

I am running Gitlab and OpenProject on my apache2 server both run well on their own but once I start Gitlab OpenProject will respond with an error that the dir wasn't found. I think this might have to ...

Which apache modules are required in an e-commerce website [on hold]

So, I have an ecommerce website to be hosted in AWS. I am using Amazon Linux with httpd24 and php56. While finetuning httpd, I notice there are a bunch of modules being loaded. Which of these are ...

KVM/qemu/libvirt VM PCI Domain/Bus/Slot/Function assignment using virt-install

I am trying to create a VM using the virt-install utility and while that is easy enough to do what I would like to be able to do is proving quite difficult. I would like to be able to specify the ...

Virtual Machines Won't Start

I right click on a virtual machine, click 'Start' and I immediately get I just created this one from scratch. I have another virtual machine that has been installed for 6 months now that doesn't work ...

SSMS Cannot show the editor for this task (Notify Operator Task) [migrated]

I'm getting an error message whenever I double click on a Notify Operator Task in our Maintenance Plans in SSMS, which says "Cannot show the editor for this task." Property IsMailHost is not ...

Restricting HTTPS for Tomcat Deployment manager

As a PCI requirement, I wanted to get the tomcat deployment manager on HTTPS as the password was flowing in plain-text. I tried few resources like this. My current connector is as given below: <...

Amazon AWS EC2 Instance Reboot

I have an Amazon AWS EC2 Instance running Ubuntu 16.04 LTS. I found that when I used systemctl reboot or shutdown -r now from the command line, I wasn't able to reconnect, but when I did a reboot from ...

Redirect Multiple Domains to Subfolders

I have two domains and both of them are pointing at the same webspace. Now I have two subfolders, each for every domain. I've researched a lot and created a .htaccess file in the root directory. ...

php-fpm user unable to run node commands

I have a vagrant instance running CentOS7. This vagrant instance is running Nginx to host websites locally on my mac. I have php-fpm running to support processing of php files. Finally, I have a php ...

How to set a DNS type A record in Google Compute Engine network [on hold]

I'm using the Google Compute Engine, I need to map a hostname to several VM's IP. Thus, I need to set a DNS type A record. I know the name server is 169.254.169.254. This is managed by Google. How can ...

Can not upload files via vsftpd server for virtual_user mode

My server is Centos 7. My config file vsftp.conf I use virtual_use_local_privs=YES to make sure use virtual user privilages. And I use root privilage to upload chown_uploads=YES chown_username=...

browser returns ERR_EMPTY_RESPONSE if https:// is not included with TDL

When a device tries to reach 'GraphWhy.org' they receive the following error 'ERR_EMPTY_RESPONSE'. Connections only occur if 'https://graphwhy.org' is entered My Nginx file follows. I have tried ...

OpenVSwitch with Libvirt

Here's my situation: I'm running CentOS 7 with Openvswitch and Libvirt/Qemu. My domains are configured to use the virtualport type openvswitch, so when I start a VM it creates a port in the ovs bridge....

What's included in the base image?

FreeBSD has some software included in the "base system", and optional software can be installed from pkg and the ports collection. What exactly is included in the base system? Is the list maintained ...

error while installing php7 FPM

I have a server with Ubuntu 16.04 installed. Righ now I'm trying to install Nginx+PHP7. I follow this instructions (so sorry that is in spanish, but you can see the commands at least). The thing is, ...

How to monitor the state of a service in Ubuntu with zabbix [on hold]

I would like to know the state of service postgreSQL on Ubuntu. I have a zabbix agent running on that server. How can I create an item to do that?

coreos etcd config using ignition

I'm trying to boot coreos on my private cloud using pxe boot using coreos official document. The process requires ignition file for cloud config, but I can't find a way to set some configuration tags ...

linux file/dir ownership and permissions [duplicate]

I am trying to access the httpd directory which has the following permissions and ownership rockwell@vm-sample /var/log$ pwd /var/log rockwell@vm-sample ~ $ ls -l /var/log/ | grep httpd drw-r-----. ...

Domain Controller was not recognized when trying demote another domain controller

When I try show the domain controllers with the command: nltest /dclist:domain.local I'm getting the following in the command prompt: DC1.domain.local [DS] Site: .... DC2.domain.local ...

Can I change the region of my Google Compute Engine project once it is deployed?

I host my node.js app and the MySQL database on Google Compute Engine. However, I would like to change the region of the instance and the whole project to another one, although my web app is fully ...

Noise canceling headphones\software (call center) [on hold]

This is kind of an IT question. I am designing a call center and would like suggestions on noise canceling headphones or software. Most noise canceling headphones that I know of help the technician ...

To-Recipient Required in Email?

I would like to know if a "To"-Recipient is required in an e-mail per definition or if all recipients could be Bcc or Cc. RFC5322 states The only required header fields are the origination date ...

File sharing on specific server not working over WAN

I have an internal only SharePoint server we're in the process of migrating off of. I have administrators of the server that up until recently were always able to use the UNC path to accomplish what ...

How to grant access to an SQS to a specific IAM user

I need to create a really simple IAM policy and grant it to a specific queue. I need to grant access (it should be a full access) to the queue only to specific IAM user. Because at the moment by ...

How do you configure BIND to forward reverse DNS queries to another DNS server?

I've got 2 domains in my environment. One of them is an active directory domain for 'myproductionlab.local' at 10.60.0.0/16 Then I have a debian box running bind9 for a domain, 'mytestlab.local' I ...

Inconsistent memcache lookups from different Google AppEngine modules of the same app

We have come across a sporadic inconsistency when doing memcache lookups from different modules (aka "services") within a single AppEngine app (Python). The scenario is as such: Module "portal" ...

Send mail without MTA, GMail, etc

Why doesn't it seem to be possible to send mails from the command line without any kind of SMTP server? All solutions that I found either use sendmail, postfix, etc. (those are SMTP servers as far as ...

how to run 10 process and montring it

i have about 10-15 FFmpeg Process for streaming server like this: ffmpeg -i "http://ip/play/a03i" -vcodec copy -acodec copy -f flv "rtmp://ip:80/APP/Name" am use the Nginx-rtmp module to run it ...

Layer three to ease router workload [on hold]

I will be beaming (microwave) to two other buildings a fast Wan connection. All three buildings share the same WAN router, and each building will have three SG500 Cisco switches. If I just use the ...

knife azure server list returns empty result

I'm trying to set up CHEF server and workstation on Ubuntu 16.04. I've followed several guides, and so far I'm able to get it to list the available images, but "knife azure server list" returns an ...

NGINX as reverse proxy in front of Apache does not work with SSL turned on

I have read every post, tutorial and comment on forums out there an for the life of me still cannot get Nginx proxy to work properly once SSL is turned withing Nginx server block. Apache is fully ...

VMware vCSA 6.5 SSO: Cannot get “Enhanced authentication plug-in” working for any browser, multiple PC's

I have successfully setup SSO with my .LOCAL domain and I can login if I type the credentials, but I cannot get the "Enhanced authentication plug-in" working for any browser, and have tried 2 PC's now....

Access EC2 Instance Without Public IP

I have two EC2 instances, one with a public IPv4 Public IP and one without one. I have the passwords for both and can successfully log into one (with the IPv4 Public IP), but am unable to access the ...

vsftpd put and get not working in SUSE linux

I have installed vsftpd on SUSE Linux which is hosted in AWS. I am able to connect to the FTP server from my local windows machine with username and password. I am also able to execute commands like ...

Reverse Proxy To Cloudfront CDN

We want to forward all requests to domain.com/foo to a S3 Bucket fronted by Cloudfront. The idea being that our domain is used while the content is loaded from S3/Cloudfront. I have Apache setup to ...
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