Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.

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How to perform common tasks for IPv6 in Firewalld?

How to open a port? How to check open ports? How to list zones for IPv6? How to list default-zone for IPv6? Does opening a port the following way applies to both IPv4 and IPv6? # firewall-cmd ...
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19 views

Source script before httpd service starts

Back in the good old days I was able to patch /etc/rc.d/init.d/httpd with some additional lines of code that executed on every apache start: start() { echo "Setting variables..." source ...
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21 views

Simplest Linux backup utility that meets following criteria

I'm looking for a backup utility for a linux box, and I've had bad luck finding one that meets all my criteria. Our backup situation is that we have one Linux server with a small CVS repository, and ...
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86 views

after install ssl certificate fatal bind xxx.xxx.xxx.xx port 587 already in use

I have an Ubuntu 12.04 server setup with Virtualmin/Webmin latest version using a self-signed certificate generated during installation working fine for more than a year without any problem. This week ...
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1answer
11 views

php-fpm and Nginx dynamic environment variable

FPM configration stats that you can retrieve variables from your current environment. However, on ubuntu using Nginx and PHP-FPM, I can not find a way to retrieve the variable value from the ...
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12 views

How to stop Cassandra and then restart

I need to shutdown the Cassandra server and then restart it again. i try with sudo service cassandra stop but its does not worked. Can anybody help me with this? thanks in advance
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15 views

Migration from kvm to xen [duplicate]

It is possible to migrate the instance from kvm to xen hypervisor, being migration from full virtualization to paravirtualization , is it possibile.
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0answers
12 views

Configure Apache to act as client and accept certificate from another server

I have a django server which accepts only HTTPS and is configured with cert/key on port X. I have to configure Apache to act as a proxy to this Server. So all requests to Port X will go to Apache ...
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9 views

How do I configure the network proxy for a Linaro system?

Under Linux flavours such as Ubuntu, one simply uses System Settings: Network and selects 'Proxy' (which generally shows up right below the 'Wired' entry) in order to set the system-wide proxy ...
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1answer
36 views

NTP server acting weird

I have an NTP server on the network that is acting very weird. I have not changed any of the ntpd.conf settings. Its a debian box and I did a regular install. I have an NTP client on the network. If ...
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2answers
7 views

Setting up emergency console access with xen

On Gandi (or other providers) you can activate an emergency console to your VM. It binds a SSH channel to a temporary IP and port. I have my own server running on xen. I would like to implement an ...
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28 views

Get max IO performance from the storage system

I am asked to measure the max IO supported by a PCI flash based storage system using FIO utility. I have also been asked to configure/fine tune the system so that I get max storage performance. My ...
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2answers
46 views

iptables: trying to block port 53 but not working

I'm messing around with IP tables and I'm trying to do the following: I have several hosts on the same network: 192.168.1.0/24. The DNS server is 192.168.1.1. I'm trying to prevent all the hosts ...
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26 views

OpenVPN on Docker

I'm just learning docker, but there are things which I don't understand. I'm trying to install OpenVPN in a docker, but it doesn't work for me. If I am install a Linux in a Docker container, it is a ...
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0answers
25 views

difference between ifdown, ifconfig stop and ONBOOT=no

my ifcfg-eth1 config as below DEVICE=eth1 TYPE=Ethernet UUID=5e4f36f8-14eb-4f0c-8fa9-3af9be3899a7 ONBOOT=no NM_CONTROLLED=yes BOOTPROTO=dhcp DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no ...
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0answers
11 views

current disk space status from multiple unix server [duplicate]

I am trying to get the details of disk space from around 100 unix server. All servers required different credential to access. This is the script I have found. for i in <server list> do echo ...
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16 views

rsyslog syntax error on non existent line

I get a syntax error message for my rsyslog configuration file at line 61. But my configuration only got 60 lines. I checked the last line in my configuration and it seems correct since it is the ...
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11 views

How ro pass Environment variable to Rundeck

I want to run a rundeck job. Would like to pass few environment variable from the node as well to the runDeck job during the run time. How to pass environment variable to rundeck? Thanks in advance
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30 views

create tunnel in order to access https via port 443

I have win machine that connected to Linux server 192.9.100.10 And Linux server has connectivity to the IBM blade center management GUI - 192.9.100.200 From my WIN machine I not have connectivity to ...
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1answer
22 views

NTP service stopped in centos7.1 linux machine

In our 3 linux boxes centos 7.1, we saw below messages in the logs and then ntpd service got stopped since the offset is more than 1000s. systemd: Time has been changed ntpd[2626]: 0.0.0.0 0617 07 ...
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1answer
26 views

Apache2 Ubuntu 500 Error

[Sun Jul 05 10:19:53.611919 2015] [mpm_event:notice] [pid 4170:tid 140530536925056] AH00489: Apache/2.4.10 (Ubuntu) configured -- resuming normal operations [Sun Jul 05 10:19:53.612026 2015] ...
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5 views

Floating time cron job [migrated]

I have a Linux host which I would like to have a cron job run on. I do not shut down this machine. I always suspend it. I want to run a job once a day and I cannot set it for a particular time since ...
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18 views

Bulk update BIND zone file from CSV [on hold]

I had to do a mass update of dns records in our bind (on debian lenny). I have no room for error and in my experience i know that bind is very sensitive syntax. I specify you : i have no backup of the ...
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1answer
26 views

can't switch to root or use sudo [on hold]

I've just come into the following problem: For some reason I can't use su or sudo: usr@usr-MS-7816:~$ su Password: su: Authentication failure usr@usr-MS-7816:~$ sudo su [sudo] password for usr: ...
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22 views

Linux: even with route, packets not going over the interface

I apologize but this is a question I jotted down when debugging another problem, so I can't provide any additional information. Anyway: suppose we have no firewall rules, and the following route ...
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12 views

How to setup web UI to view Master Spark Node from Host Machine

I think the solution is to port forward twice, but I am unable to ssh into the master (source) machine: How do I view the Spark web UI? I am following this tutorial: ...
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1answer
48 views

Firewall: allow all traffic from sources authenticated via. an open ssh connection

I'm looking for a way to avoid the editing of the firewall rules all the time on test and dev servers. I don't want to open up all ports. So I thought maybe there is a way to allow all traffic from ...
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2answers
42 views

Download speed from server extremaly slow

I have rented many servers @server4you and from time to I face the same problem. Download speed from a server decreases dramatically and after some weeks goes back to normal. Now when I download a ...
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1answer
40 views

Logrotate deleting instead of rotating

This is my logrotate configuration /var/log/abc/*.log { missingok compress sharedscripts create 640 root root postrotate /etc/init.d/abc reload endscript } When i run this manually as logrotate ...
2
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1answer
21 views

Why isn't my ZFS pool expanding using ZFS on Linux?

I have a ZFS zpool on linux under kernel 2.6.32-431.11.2.el6.x86_64 which has a single vdev. The vdev is a SAN device. I expanded the size of the SAN, and despite the zpool having autoexpand set to ...
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0answers
13 views

Recommended setup for F5 with multiple EXIM servers behind

I have following setup: 4 EXIM 4.80.1 servers. All mail relay clients are redhat linux , I use mailx command for testing relay from clients specified in "hostlist" on exim.conf Have valid cert ...
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2answers
111 views

Full data backup to Amazon S3

I have an Ubuntu server hosted on Digital Ocean that has outgrown it's existing backup solution. The relevant parts of the stack I use are Node.js, MongoDB, and Elasticsearch. So far backups have ...
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19 views

debian networking lacp throughput and redundancy

I am encountering the following scenario: Physical server w/ 4 NICs and two HP ProCurve GigabitEthernet switches in a stack $Server runs debian (proxmox ve latest) I'd like to configure the network ...
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1answer
21 views

How configure environment variable with AcceptEnv

In /etc/ssh/sshd_config, there is an option called AcceptEnv that allows the ssh client to send environment variables. I need to be able to send a large number of environment variables, how can i do ...
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19 views

Complete full virtualmin setup from command line

I'm working on adding a feature to a suite of tools my clients use that will allow them to enter the API key of their DO account, and easily create DO droplets with Virtualmin on them, and setup and ...
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14 views

How long does it take to change partition sizes?

I lease a dedicated web server running CentOS. It has 2x120GB SSDs in a software RAID-1 array. The following partitions exist on the machine: MOUNT TOTAL USED ====================== / ...
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1answer
37 views
+50

Restore “snapshot” of OS partition on physical Linux server to spare partition then boot - caveats?

We're planning to bring a new physical server online in the near future and as part of the disaster recovery / change management plan, I want to be able to easily roll back the operating system and ...
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0answers
8 views

NIS not respecting files first in nsswitch.conf

Okay, first off, I know NIS is a turd, but it's what we've got until we do a major migration next year. Today we had a NIS server outage which predictably prevents user logins. What surprised me was ...
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2answers
48 views

List of packages for RH 5.x

I need to install SSSD onto some of my client's servers, but a few of them are pretty old. Is there a list of all of the packages in the repository for a specific release of redhat? Specifically I ...
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1answer
25 views

How do I run TomEE as a service on RHEL6?

cat /etc/passwd (last line): tomee:x:990:987::/home/tomee:/bin/false I need to make an init.d script to run Tomcat EE like service tomee start. So I have 2 problems: How I can execute command ...
0
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1answer
13 views

PHP-FPM on Linux, SCHED_BATCH or SCHED_OTHER?

I have a Linux webserver (Ubuntu 12.04, kernel 3.2.0) running Magento with quite a number of PHP-FPM child processes. Since Magento is a heavy framework, I often see several child processes to baloon ...
2
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1answer
15 views

Apache2 not able to list directories or files that do not have o+r set

I have an Apache webserver that we are preparing to serve data uploaded via FTP/S to our customers over the more convenient HTTPS protocol. At the moment I am using mod_authnz_external to allow the ...
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1answer
31 views

NXLog unable to read complete .csv file

I try to work out why NXLog can't read the complete .csf file witch has the same name but gets edited every 12 hours by windows for a export. conf file of NXLog: #define ROOT C:\Program Files\nxlog ...
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1answer
16 views

How do i find the overcommit ratio for CPU on a KVM host or for that matter on any hypervisor?

I have a host and I have installed KVM on it.Now I need to know how much overcommiting of resources it allows, CPU, memory. Is there some command to get the ratios or it all exists in theory and no ...
2
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1answer
28 views

How update passwords of user's already existing in ldap?

I want to update passwords [user's already existing in ldap] of the user by importing data from /etc/passwd and /etc/shadow. How to achieve this? I will give the overview of my setup. Nodes user ...
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1answer
9 views

Filezilla transfer file name colon replace

I have transferred a massive amount of files by filezilla. But a few scattered files are pending being transferred. They had failed since my filezilla server is on windows and filezilla client is on ...
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2answers
49 views

CentOS Server - Available disk space constantly drops

The result of the df command : Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 864000688 809338092 10773908 99% / tmpfs 32965940 0 32965940 0% ...
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1answer
26 views

Make Apache webserver in Ubuntu point to another location [on hold]

I am completely new to Linux administration. I have an Apache server up and running. When typing "localhost" in the browser, the default Apache page from /var/www/html is displayed. Now I have to type ...
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20 views

Create and synchronize development, staging and production servers?

I'm building a PHP application, and I'm running all the development environment (Netbeans IDE, Apache, PHP and PostgreSQL) inside the same virtual machine. I would like to prepare three diferents ...
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11 views

what the best approach to get the network values on Linux machines [duplicate]

what the major difference between ip addr command to ifconfig -a command? both command are give the same values network IP's ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc ...