Newest Questions

Q&A for system and network administrators

Does bonding 3 1G NICs into one make a 3G NIC?

For example, I have 3 NICs (1GB) and make a bonded NIC. Do I get a 3GB NIC? Should I connect these 3 NICs into 1 switch? If one NIC dies, do I still have the network between server and switch alive? ...

Hardware security module

We plan to setup HSM in our DC for storing cryptographic keys. AWS HSM uses SafeNet Luna. We thought we could use the same in our DC. The below model seems attractive. SafeNet PCIe HSM 1700 Model ...

Obtain hardcopy from a screen session

I have a job launched in a screen session which is expected to run for several hours. From time to time I'm requested to check if job is still running and guess at wich % of work is. Guess if it is ...

custom dnsmasq (or custom options) with libvrt?

Currently only two options related to network boot are available in libvirt via bootp options: server and file So for config like this: <bootp file='test.ipx' server='10.10.10.2'/> this code ...

I can’t connect to my Azure VM

After I used this command: ifdown eth0 can't connect to my VM (centos 6 ) with ssh on cloud microsft azure. How can I fix it?

How to add an Additonal NIC to a linux guest host, on KVM

I want to add additional NIC to centos6.5 guest, which is on KVM When i open virt-manager i cant see any options to edit the guest system Is there any command to add NIC on the guest host...

Need to configure a cluster and need to know the

I have now a web system in Linux with Apache and PostgreSQL. I need to configure a high availability cluster for that server with a secondary server with the same features of the actual server; so i ...

Sudo redirected stdout file ownership

I am redirecting stdout from a sudo. However, the file ownership of the output file is the user who ran sudo, not the sudo target user. I'm logged in as 'root' for the command below: sudo -u ...

RAM usage is high altough there is no high usage from proccesses?

Our virtual server has Centos 6 OS. When I look to buffer/cache usage it seems less at first line. Proccesses're not use to memory highly. Do u have any idea about this situation? Can it be about ...

Name resolution and DNS registration for a CentOS 7 Azure VM

I have a Linux VM (CentOS 7.2) running on Azure, which is configured as a DHCP client because this is required by the Azure platform; Azure DHCP correctly supplies a network configuration to the VM, ...

Simba ODBC driver (130) Unable to authenticate with Google BigQuery

When I trying to connect to BigQuery with Simba ODBC driver using service authentication, I have error (130) Unable to authenticate with Google BigQuery. But only on Windows Server 2012 R2. For ...

Configuring the hostnameo f my mail/web server

I've been working the last few days to configure a webserver on a VPS. I wanted for this VPS to handle my emails as well and so I installed Postfix and Dovecot. After a big deal of configuring, I ...

Authentication in IIS 8.5 is resolved with app pool recycling, but not with IIS reset

After IIS reset, all authentication requests fail (windows authentication). Any other IIS reset doesn't help, but if I restart the web application or recycle the app pool, everything works fine. How ...

Will I lose software Raid if I reinstall OS on new hard disk?

I currently have Raid 10 with madadm, I need to reinstall the OS on a new hard disk, Will I lose the raid 10 after the reinstallation? The OS disk is not part of the raid 10. will this command can do ...

Nginx dynamic sub folder as fastcgi_param

I have a php site being served by nginx. I want to be able to access it via different sub folders. Basically, a user can sign up and when they do they choose set a "url". Based on that, they will ...

Server throws LimitInternalRecursion error when using htacess

I'm quite new to .htaccess and I just didn't get into it enough to understand what's going on. The server just says, limit of 10 internal redirects exceeded even though I can't see any reason for it ...

issue with slow Windows 10 file share

I am currently facing the following weird problem: In a small workgroup there is an application installed on all clients that accesses a database and related files on a network share on a Windows 10 ...

Translating htaccess rewrite rules to Apache2 virtualhost rules

I'm trying to set a wildcard subdomain RewriteRule by combining some .htaccess rules I'd successfully implemented before, under the belief that I can use the same rules for my Apache vhosts file. In ...

Create non-root user and disable root SSH in Ansible

I'm trying to write an Ansible playbook to bootstrap my servers. By default on Linode I can only login as root with a password, so my playbook logs in as root, creates a non-root user with an SSH key, ...

How to signal the presence of a pattern via exit code, without altering STDOUT

I need to run cmd1. If and only if PATTERN is missing from its STDOUT, i need to run cmd2 too: cmd1 | grep "$PATTERN" || cmd2 But I'd like to see all output from cmd1, not just the lines that ...

Windows DNS server recursive resolving issue with dns policy

I am using dns policy with windows dns server. In my scenario I want to allow recursive queries in local subnet (192.168.1.0/24) and deny for others. It works great until querying for a domain (...

Postfix TLS Issues

We had a previous colleague set up webmin with postfix to allow SMS messages to be sent from application servers and from email. He left under a dark cloud and never provided any hand over! Recently ...

Varnish 5.1 best way to achieve mobile redirection with specific backend

I have Varnish 5.1.1 installed and I'm using 2 backends for the same site, one for mobile version and one for desktop version. my default.vcl: vcl 4.0; # Device detection mobile or PC include "/etc/...

Can one change a group to a subgroup in GitLab?

GitLab's 9.0 release brought subgroups. However, before subgroups were possible, we've worked around that restriction by using a prefix, e.g. FOO/… FOO-bar/… FOO-bax/… FOO-bax-quux/… … The correct ...

Is it possible to see the login history on Office 365?

I would like to know if it's possible to see the login history on Office 365, and eventually the login attempts as well? Seems like the consumer version of Outlook has this but I can't find anything ...

Reassembly fails at destination

Say I have Host1 & 2 connected to a router with different speeds. Host1 <--100 Mbps--> Router <--10 Mbps--> Host2 Host1 sends 10MB of UDP data using nc command to Host2, but the ...

Can a DHCP IP Lease timeout cause odd network dropouts?

I have just taken control of a small-ish company network (1 server, 60 workstations) They have been experiencing periodic file server dropouts, and I just came across this situation: The internet ...

How do I choose a vps or dedicated server? [duplicate]

I'm facing the issue of choosing a service for my company. I have to setup an owncloud server, an email server and a web server. I was thinking of a dedicated server with at least 2x1TB disks for ...

Docker login message

I'm using Docker + wetty to create a test environment. I wanna show some disclaimer before the "xxxxx login:" prompt. I've edited '/etc/issue', '/etc/issue.net', and '/etc/motd', but still nothing is ...

how to know huge folder size immediately (like desktop indexing)?

I'm working on ssh, and trying to know a folder size, it takes ages, more than an hour, it a folder of folders of images... that can have millions of files.. usually, on a linux desktop when you ...

Strange filezilla timeout issue with pure-ftpd [on hold]

I'm running a DirectAdmin server on Debian 7, using pure-ftpd 1.0.43 After a while of being connected to my server (and no other server) the FileZilla console shows me this: Status: Disconnected ...

Gmail “send as” feature with on premise exchange account

Scenario: I am responsible for 2 different companies mail flow. Company A uses G Suite for mail and Company B uses on premise Exchange 2016. There is one employee that works for both companies and ...

Receiving mail from Gmail delayed - PTR issue?

One of our partners receives our mails with noticeable delays. The same mail sent to two addresses under their domain are sometimes delivered at their server hours apart (checked in the actual server ...

NFS mounting issue: No such file or directory

Dears, please forgive me if this is a repeated question, I'm thankful if you refer: Machine of discussion: SUN M5000 Server, running solaris 5.10. My clients are having a backup shared folder that is ...

Firewall (VyOS) block p2p

I have VyOS router, I want to block p2p traffic. Which ports must be blocked?. I tried 6881-6999, but it does not work. Thank you in advance for your help set firewall name "FIREWALL-IN" set ...

Properly manage iptables rules on Docker host

I am using Gentoo and Docker. I have bunch of own iptables rules, and keep them in /var/lib/iptables/rules-save. Docker adding bunch of own rules when start. It seems that iptables is auto-saving ...

Self hosted mail server can send but not receive

I have trouble with setting up a mail server on my LEMP Stack. This was the tutorial I followed: http://www.krizna.com/ubuntu/setup-mail-server-ubuntu-14-04/ So, basically I set up Postfix and ...

Nginx throttle download speed based on filesize

I am using nginx/1.11.11 compiled from the source with the mp4 module and I am serving video files from 300MB size up to 8GB. I am thinking of implementing a throttle system similar to google's drive....

Gitlab fails to upgrade to 9th version

This is what I have, [git]~> dpkg -l | grep gitlab rc gitlab 7.7.2-omnibus.5.4.2.ci-1 amd64 The full stack of gitlab iF gitlab-ce ...

distributed data center on personal machines

I know this might not be the best place for this but I need an expert opinion on this. So, here's the thing. I was approached by a friend to join a MLM company that for me sounds like a big scam. I ...

LXD migrate containers to new storage backed

on my host i have ubuntu 16.10 No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.10 Release: 16.10 Codename: yakkety and i use LXD from stable repo lxc --version 2....

jenkins build error : No such file or directory

My Issue : When I build using jenkins , I am getting error as No such file. But that file exists. jenkins@ip-172-31-22-20:~/jobs$ ls -lthr /var/lib/jenkins/jobs/github-commit-status-api/builds/43/...

iis 7.5 website bindings do not work properly

I have an server who has one publis IP and several virtual IP's assigned. On this server runs an IIS 7.5 with several Websites. I have this situation: online.customer.ch Typ |hostname |...

KVM guests show wrong source IP in apache logs

I have a few KVM guests running on a Fedora 22 host using a bridged network. It all seems to be woring fine apart from one niggle. One of the guests has apache running on it. Any access to the web ...

Centos 7 not booting from Dell Perc 6i raid 0

I recently obtained a poweredge 2900 (unknown generation) tower with a perc 6i controller and built and initalize a raid 0 array from 2 146gb sas drives. During the centos installation it does see and ...

How can I route traffic from VM to remote server using hosts vpn client (Anyconnect)?

My goal is to set up application communication between a client and a server. The client is on my Windows Server 2012R2 VM that resides on VMWare Player 12. The host is a Windows 10, on this one I ...

How to create a SPF record? [duplicate]

How to create a SPF record for a server?...I have purchased a 3rd party server called Linode Server but I have added a TXT record with the SPF value but still when I validate my server using the ...

What is the most commonly used sensors in a server [on hold]

What is the most commonly used sensor in server? Active sensor or passive sensor? Like monitoring when power is cut off.

Enable modsecurity SecRuleEngine On for only a specific directory

Running Apache 2.2.x, modSecurity 2.8.0 I'm trying to get something like this working: # Default recommended configuration SecRuleEngine DetectionOnly # Settings options: DetectionOnly,On,Off # ...

Prevent php script from overriding php.ini

How can I prevent php scripts from overriding max_execution_time value ? Someone found a way to inject malicious code on a server through wordpress... We are in the process of patching the ...
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