Tagged Questions

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

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1 views

How to flush DNS resolver cache on Linux (and FreeBSD)

I am admin for several Linux and FreeBSD servers and here is a problem I have: The servers run a tool that does a lot of DNS queries every minute for the entire network. When it does a query, the ...
-1
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0answers
13 views

How Can I Give My VPN Clients Internet Access

I have been successful in setting up two OpenVPN servers as follows: Ubuntu1 (LAN IP: 172.23.6.148 WAN IP: 60.242.175.132) Ubuntu2 (LAN IP: 172.23.6.149 WAN IP: 60.242.175.133) Clients ...
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0answers
8 views

Separate L2TP/IPsec VPNs with dynamic VLAN assignment

I am working on a Linux (Debian 7) VPN concentrator for different kinds of remote access. One of the offered protocols is L2TP/IPsec because of the client availability. I am using xl2tpd which in turn ...
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2answers
31 views

Linux virtual memory tuning to workaround disk I/O issue

I am having a problem with a Linux server that it is writing to much to disk, thus I am having a slow response time due to a big IO wait. I already check smart values for the disks and are OK. This is ...
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0answers
8 views

Synaptics touchpad LED support [migrated]

How to enabled support the LED in Synaptics touchpads? I'm use Debian Jessie and xserver-xorg-input-synaptics ver. 1.8.1-1. I'm find patches by Takashi Iwai from SUSE for supporting the LED in ...
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0answers
13 views

MySQL crashed and was not able to restart until clearing a table

I have MySQL unning on my Ubuntu server and suddently the MySQL was down. When trying to restart it, the restart failed due to xxx table is marked as crashed and last (automatic ) repair failed So ...
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0answers
18 views

Disable autoconfiguration of new network interface on Linux

I am running Ubuntu Linux and whenever I insert an external network card to my computer, it automatically creates a new interface (that is okay) but also instantly giving the interface an IP address. ...
0
votes
1answer
5 views

How to add systemd.setenv in GRUB2

I would like to add systemd.setenv=NSS_HASH_ALG_SUPPORT=+MD5 parameter in grub2 for centos7? I don't know which files I've to modify, and which lines I've to insert this parameter. Thaks for your ...
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0answers
35 views

Only allow SSH from specific IP to evade VPN connection?

I want a Linux server to use the VPN connection for all traffic that is not SSH from a specific IP. If the VPN connection becomes unavailable, not other communication than SSH with the specific IP ...
1
vote
1answer
57 views

Unable to open WireShark in CentOS 6.5

I have installed WireShark in CentOS 6.5 with the following packages using Yum. Dependencies Resolved ================================================================================ Package ...
0
votes
1answer
19 views

Monitoring/Warning for IOWait

I had a downtime today on my server because of a high IOWait. I could not do mostly anything on the server, I managed only to run top to see the IOWait, but I did not have iotop installed at that ...
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0answers
10 views

communication between containers in docker other than sockets/network

Is there any to way to communicate among docker containers other than via sockets/network? May be it can be IPC or some other means. Is it feasible? I have read docker documentation which says we ...
0
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0answers
13 views

Cron occasionally fails with “grandchild #X failed with exit status 3”

I have cron jobs and every now and then they fail. Just after log message that the command has started, there is grandchild #X failed with exit status 3 message. On the next run scripts finishes ...
0
votes
0answers
7 views

EXSI4.0. 2 different kernels - one boots other locks up immediately, how to check initrd difference

I have a ESXI4.0.0 (v4) host, where I am trying to install a guest. The host machine is a regular Intel PC. I have 2 different ISO images (heavily modified version of SLES for a commercial product), ...
1
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0answers
13 views

SFTP encountering Bad Message

I am uploading a file via sftp to a remote server. While on transfer, I got a message that says, "stalled". I killed the sftp running on my local. The problem is, I cannot delete the partially ...
0
votes
0answers
7 views

Apache on Centos 6.5 Purge of LDAP cache failed

My logs are filling up with: Purge of LDAP cache failed I have researched as much as I can, and I cannot find a fix. I am running the latest (as of this post) version of Apache, PHP and all of the ...
0
votes
1answer
31 views

Linux Authentication by Active Directory without joining to domain

I have a Win 2008 AD based network. I want to setup a few boxes with dual boot Win/Linux. How can I achieve to authenticate the users with existing AD in Linux? All solutions - I have found yet - ...
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0answers
19 views

Geo-file synchronisation between nodes

I set-up dual (multiple in future) node load-balance/fail-over web server (Using CentOS 6). Everything went well except one "little" thing: I need file "sync" (Replication). I need it to go multiple ...
0
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2answers
57 views

IPTables only solution to block any IP address who has made too many connections or reconnections

I’m looking for an IPTables only solution to block any IP address who has made too many (e.g. more than 5) connections or reconnections within a short period of time (e.g. 1 minutes) on a certain ...
0
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2answers
27 views

Nginx uLimit 'worker_connections exceed open file resource limit: 1024'

I keep getting this error in nginx/error.log and its driving me nuts: 8096 worker_connections exceed open file resource limit: 1024 I've tried everything I can think of and cant figure out what is ...
0
votes
1answer
26 views

Choose hardware for MySQL server with 1-2k rps [duplicate]

I am looking for new DB server. I'd like to know your opinions and recommendations. Current server spec: We use DB server for website with 100-200 req per sec(i plan growth up to 200-250) Today we ...
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0answers
17 views

aws instance froze, how to find out what went wrong

So we have a instance on AWS that runs CouchDB which was down and not accessible until we rebooted the box (which took a long time). The instance is back up now and I am trying to figure out what ...
0
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0answers
9 views

Keepalived: NAT VIP for internal network unused?

I'm building a proof-of-concept loadbalancer with CentOS 7 and keepalived. I took Red Hat's load balancer administration guide as a reference and implemented a NAT'ed loadbalancer with 2 nodes which ...
0
votes
3answers
66 views

My Certificate doesn't work on all machines

I installed Centos7 on my new brand server. I use LDAP as authentication. I deployed my certificate on all server and LDAPS is working with RHEL5, Debian or SOLARIS On Centos7, I 've got problem ...
2
votes
1answer
21 views

Secure permissions setup for Drupal website with multiple maintainers

For several Drupal sites a colleague of mine and I (for demonstration purposes alice and bob) are responsible for maintaining these installations. We both have an SSH account to log into the server ...
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votes
0answers
7 views

403 error on subfolders on vhost [on hold]

i have a subdomain (virtual host) on my apache. The root-domain (sub.domain.de) is okay, but when i try to receive sub.domain.de/icons/ i get a 403 forbidden error. Here are my log files: [Thu Oct 30 ...
1
vote
1answer
28 views

Apache can't reading from documentroot with permissions for www-data

My OS is Linux Mint 17. My goal is allow reading of /mnt/wwwdata for root and apache only. I trying to setup apache document root in directory /mnt/wwwdata, with rights 0770 for group wwwadmins, ...
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votes
1answer
34 views

What is mean ETA in web hosting industry? [on hold]

All of our servers down. Our web hosting provider says "We do not have an ETA of when this problem will be resolved." What is mean ETA?
0
votes
1answer
24 views

How to respawn a script in RHEL/Centos6 when /etc/inittab has been deprecated?

I have a custom init script and I want that script to be respawned if in case the process dies. In RHEL/Centos 6 /etc/inittab is deprecated. So how should I ensure the process will be respawned?
0
votes
0answers
28 views

Output of 'ls' changes every time it runs in CIFS mounted windows share - RHEL 4

I have a RHEL 4 server in our organisation. One windows (2003) share is mounted on the server using CIFS. Output mount shows something like this: //windows.server.fqdn/share on /mnt/shared1 type cifs ...
0
votes
1answer
45 views

How to grep a continuous stream, with paging

I posted this to Superuser but got no takers: http://superuser.com/questions/832578/how-to-grep-a-continuous-stream-with-paging I want to take a log file and filter out some irrelevant log entries, ...
0
votes
1answer
24 views

Routing particular service over vpn

Running Ubuntu 14.04 LTS. I need to connect to a SMB share that isn't local. The only way I can connect to it is over a VPN. The particular VPN service is Juniper. Connecting to the VPN is easy and ...
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votes
0answers
27 views

Is there an existing FOSS solution that would allow me to increase bandwidth through inverse multiplexing? [on hold]

Alright, hear me out on this one. I have a Linux VPS (with very fast internet speed and bandwidth), an Android phone, and a Windows computer (I also have access to Linux/BSD computers, etc). On my ...
2
votes
2answers
39 views

Improving speed of large file transfer over high latency link

So, I've recently had the need to pull a large file over the internet from one of our offices overseas. Both offices have 50Mbit fibre links in both directions, but the round-trip-time is horrendous ...
1
vote
1answer
31 views

Copy file from Windows host to Linux host via Rsync, then set permissions

So I have a Windows SFTP server (SFTPSERVER), which receives files (duh). I then need to push those files to a Linux server (AD authenticated to my domain) elsewhere in my organzation. So that bit I ...
1
vote
0answers
16 views

Git/svn - keeping synced two repositories with different access rights

I've been advised by @PatrickQuirk to post this question here... There is just too much information online for me to understand and be able to get my own picture, so I gently ask the community to ...
0
votes
2answers
30 views

What is the benefit of cloudfares or inkapsulas etc ddos protection [on hold]

My Server get even more attacked via DDOS. And im thinking about buying a service like cloudfare or incapsule for preventing DDOS. But i dont understand one thing. When the attackers see that the ...
6
votes
3answers
642 views

Why does the “free” command and “dmidecode” show different values for RAM?

I've got a CentOS 5.10 (32-bit) server running on VMWare. It's allocated 4 GB of RAM. If I run dmidecode -t 17 | grep Size | grep MB I see: Size: 4096 MB Yet when I run free, I see: ...
-1
votes
1answer
29 views

Permissions/groups setup

I have setup up a Group that includes a few users (mygroup) then have set the owner of a web directory to be apache and the group to be mygroup. chown -R apache:mygroup /home/myweb Then I have set ...
0
votes
1answer
25 views

How can I configure my DHCP server to distribute IP routes?

I have a DHCP server (Linux, IPCop, dnsmasq) running on my default gateway server 192.168.0.1. I have a VPN endpoint on another server in the network (192.168.0.4). Is it possible to configure the ...
5
votes
3answers
284 views

Isolated development environment on Ubuntu

I want to create an isolated ubuntu environment on which to install and configure some applications that need to comunicate on the network and be accessed through http. I want to be able to run my own ...
0
votes
0answers
22 views

Linux: routing within 2 internal networks

We have a network that contains one gateway server with 3 network interfaces: eth0: (global IP) eth1: (internal IP 192.168.0.0/24) ib0: (internal IP 10.2.2.0/24) The other servers in the network ...
0
votes
0answers
20 views

lvm disk corrupt after force power down

I have virtual machine running on kvm host. But after force shutdown (unplugged power supply of physical server), virtual disk corrupted, cannot boot to OS (OS: CentOS 32bit, include 2 partition, ...
0
votes
0answers
59 views

Server bogs down during builds [on hold]

I am one of 6 engineers using a common build server to build images for embedded Linux systems. The build server is a 40-cpu system. Occasionally (maybe once a month or so?), the system gets bogged ...
0
votes
0answers
16 views

Is it possible to use listening socket for initiating client connection?

Today I noticed such a situation: [root@cwf-hmaster.staging-scp ~]#netstat -taupen | grep 54310 tcp 0 0 ::ffff:10.0.12.209:54310 ::ffff:10.0.12.209:54310 TIME_WAIT 0 0 ...
1
vote
1answer
21 views

Postfix - Allow delivery for my domain but block mail to root@localhost for all but local system

I use Postfix as an MTA to receive mail for my domain. Recently I've started to get some mails coming in to root@localhost from external IPs trying to exploit bash. My bash is patched so I should be ...
1
vote
1answer
52 views

Find a script which writes in /var/tmp [duplicate]

I discover that one of my partition was full. rootfs 20G 1,8G 17G 10% / /dev/root 20G 1,8G 17G 10% / devtmpfs 7,8G 184K 7,8G 1% /dev none ...
1
vote
0answers
19 views

SNMP memory values do not match `free`

Compare this # free -m total used free shared buffers cached Mem: 72363 68035 4328 0 522 66294 -/+ buffers/cache: ...
1
vote
1answer
25 views

iptables destination NAT from one range to another

I am trying to make destination NAT from one range (192.168.2.0/24) to corresponding ip addresses in another range (192.168.1.0/24). I have managed to do this ip by ip iptables -t nat -A PREROUTING ...
3
votes
1answer
34 views

SLES 10 SP4 (x86_64) - HP Proliant DL380 G4 - Becomes unresponsive randomly

Had the misfortune of upgrading a HP Proliant DL380 G4 from SLES 10 SP2 (i586) to SLES 10 SP4 (x86_64). Although the installation completed smoothly, the server became unresponsive after a couple of ...