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

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28 views

Multiple pearl processess all hitting one IP address DDOS source hack? [duplicate]

I have been running at high CPU loads 45 45 45 ish for a while, updated cpanel / apache so far but tracing PID's that are running I find the following all with the same IP.. [code] select(8, [3], ...
2
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3answers
84 views

rsync many small files with long filenames takes a lot of bandwidth

I have a file storage server which stores files on disk using the file's sha256 hash as the filename, along with the file extension, and in three levels of directories, e.g. a PDF file with sha256 ...
-2
votes
0answers
12 views

Fedora 8 on intel atom device using live image burn with unetboot [migrated]

I'm new in LINUX, and I've been installing fedora 8 live image on intel atom based cpu ( installed on the harddrive, not usbstick) I have a running internet connection (router, Windows based PC, and ...
2
votes
2answers
32 views

After a while ssh connection freezes when a command run remotely produces a lot of output

The situation is this: there is a an ssh client (Ubuntu 14.04) and an ssh server (Debian 7). There is a bunch of networking in between them. SSH connection is easily (and quickly) established and ...
-2
votes
1answer
11 views

Port 5005 on my VPS is listening, but closed

I have a program running on port 5005, and the port is listening and accessible via localhost: znc-admin:~/.znc$ netstat -tulpn | grep 5005 (Not all processes could be identified, non-owned process ...
0
votes
1answer
22 views

Best Practice for Mailbox Backup (IMAP)? With Webinterface?

Situation: Debian Mailserver with ISPconfig3, Postfix and Dovecot, about 500 Users with different Domains. Server is a virtual client, so i backup it via XenBackup. Problem: If a user delete a single ...
1
vote
1answer
20 views

inetd and echo service

inetd - From Wikipedia, inetd (internet service daemon) is a super-server daemon on many Unix systems that provides Internet services. For each configured service, it listens for requests from ...
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0answers
14 views

Linux - modify incoming packets before forwarding:

I'm using a Linux (Debian based) system on which IP forwarding is enabled (/proc/sys/net/ipv4/ip_forward is set to 1). I can read the incoming packets using a raw sockets program, but I want to modify ...
0
votes
1answer
20 views

gnupg 'libgpg-error.so.0 no version information available'

I'm trying to compile gnupg-2.1.0 for Debian Wheezy, I've downloaded and compiled the required libraries (libgpg-error-1.17, libgcrypt-1.6.2, libksba-1.3.2, libassuan-2.1.3, and pth-2.0.7 in that ...
0
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0answers
22 views

Monitor network statistics with vnstat on CoreOS?

I notice that vnstat isn't installed on CoreOS. Is there a comparable way to monitor network usage on a CoreOS cluster? Certainly one could run vnstat through a Docker container but I assume that ...
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0answers
15 views

Error when I rsync site to vesta before adding it to the CP

Well I rsynced all the sites folders from my old host to one running vestacp with the idea to add them and configure in the VestaCP later. Seems that when the directory with the site is already ...
0
votes
1answer
19 views

Monit failed to start shell script

So I am having a problem with monit starting a process this is my code: check process program_1 matching "program_1" start program = "/home/user1/files/start.sh" stop program = ...
3
votes
3answers
41 views

Add a Message to be Displayed During Shutdown of CentOS 6 and 7

When issuing a reboot or shutdown I see: [kbrandt@ny-kbrandt01: ~] sudo reboot [sudo] password for kbrandt: Broadcast message from kbrandt@ny-kbrandt01.ds.stackexchange.com (/dev/pts/3) at 14:50 ...
-1
votes
0answers
18 views

Can I connect two Linux systems via USB? [migrated]

I would like to hook up my new Raspberry Pi A+ to an older B model without having to connect the A+ to WiFi. Can I connect them somehow via USB? Can I do it with a hub in between?
0
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0answers
15 views

iptables NATed traffic is not getting ack back

Ok, I'm trying to setup the classic iptables DNAT/SNAT scenario (RHEL 6.5, 2.6.32-431.17.1.el6.ppc64 kernel ): *Host A 172.16.0.0/24 nets Host B 172.16.0.0/24 + 192.168.0.0/24 nets Host C ...
2
votes
3answers
43 views

java program out of memory before reaching xmx

On a Redhat CentOS 6.4 are only a few process running, using about 3GB RAM (System has 12GB available). One of the processes is a WSO2ESB Server (java), we start it with those parameters: -Xms2048m ...
-1
votes
1answer
26 views

Ubuntu server suddenly freeze 12.04LTS

I am using Ubuntu to host a Java server application and apache2 for website. The server is running well for a month and it suddenly get frozen. The java server application has no response. Apache ...
0
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0answers
14 views

Monitor link status with monit

Does anybody know a good way to monitor an ethernet link status (packet losss, connection loss) with monit? The default config file only provides 1 example for network monitoring (through pings and ...
-1
votes
0answers
43 views

Convert all received attachments into PDF files [on hold]

I am trying to make my server do the following: Receive email Check for attachments in the email message If there is an attachment; check for the attachment format If it is doc, jpg, bmp, etc ...
2
votes
2answers
41 views

Putty Kerberos/GSSAPI authentication

I configured a few Linux servers to authenticate with Active Directory Kerberos using sssd on RHEL6. I also enabled GSSAPI authentication in hopes of passwordless logins. But I can't seem to get ...
0
votes
1answer
26 views

Is Ploop a bad idea for OpenVZ?

I know that with Ploop you lose disk space as files are added/deleted within a container and you have to manually compact the container, but i have also read that if you reboot or there is a crash the ...
-1
votes
0answers
11 views

how to get tripwire to warn if a file exists

When I configure tripwire policy, I have to comment out files that don't exist so tripwire doesn't give an error. But what if I want to test for a file suddenly existing? Suppose I want to test, for ...
1
vote
1answer
27 views

Different postfix relayhost based on system user?

How do I configure Postfix to send email through a different relayhost based the system user? The current setup has relayhost= set so all mail goes through that smtp server but I would like Postfix ...
0
votes
0answers
15 views

Centos and Strongswan

I'm trying to implement a strongswan solution for a site to site tunnel between me and a third party vendor. My tunnel establishes fine between myself and the vendor however I am wondering if this is ...
-1
votes
2answers
36 views

How to manage server configurations for small projects and servers? [on hold]

I have been developing a web application which recently launched. Now I am continuing with improvements and want to create a staging server similar to the production server. I know of the existence ...
1
vote
5answers
57 views

Get number of TCP established connections

On a Linux server one can use netstat -tan | grep ESTABLISHED| wc -l but this will not work on a high load server with watch -n1. Such approach works fine if the server is not very busy or the ...
1
vote
2answers
99 views

Managing IPv6 rDNS

Still very new to IPv6 and I talked to my datacenter and they do not do rDNS for IPv6. Unfortunately we currently do not support rDNS for IPv6 allocations. We can however delegate the IP block ...
1
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0answers
24 views

Improve read performance on ext4 on Centos with software raid1? [duplicate]

I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions: # df -h Filesystem Size Used Avail Use% ...
-1
votes
1answer
30 views

How to release the physical and virtual memory used from the mysql server? [on hold]

Several php scripts are executed from cron on my CentOS 6.5, every php script contain database requests. Depending on the php object size and type the database requests can allocate too much memory. ...
0
votes
1answer
26 views

when is the jvm heap allocated by the OS

One of our sap systems(PI ABAP+JAVA stack) was giving performance issue. The entire 64GB configured for the machine gets hogged up(and the 8 cores as well). Every one is suspecting the java part,but i ...
0
votes
1answer
20 views

What causes “SYN to LISTEN sockets dropped”?

A quite busy proxy server has lots of "SYNs to LISTEN sockets dropped". I learned one cause could be a too small backlog size. But in that case the "times the listen queue of a socket overflowed" ...
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votes
0answers
13 views

How to setup mailx to queue locally while forwarding to a relay

I have a mail-script running on about 40-50 servers, mailing me stats, logs, etc. about the machines. This script uses mailx to sendmail using the .rc file located in /etc/mail.rc. In this mail.rc I ...
2
votes
1answer
28 views

Using a JBOD for redundant NFS

I have a Xyratex sp-2224 JBOD enclosure (dual controller) and a pair of Dell servers with SAS HBAs installed that I'm looking to utilize in a redundant NFS cluster. The hardware isn't what I'm ...
-2
votes
1answer
38 views

Mismatch of IP Address in our linux machines? [on hold]

I have few Ubuntu machines in which I have our app servers running which is trying to connect to another set of RHEL machines in which I have our Cassandra cluster running. Now as I said, my app ...
0
votes
1answer
29 views

Can I compile PHP 5.2.17 on CentOS 6.5, then copy it to a similar server?

I have two CentOS 6.5 VMs/servers with Plesk 12 installed on both. On on of these servers, lets call it server 1, I have compiled PHP 5.2.17 - yes I know this is old etc. however two sites I host ...
0
votes
0answers
39 views

sshd with port forwarding left connections to localhost without counterparty process

After temporary tunnel setup from X.X.X.X , from where I ran ssh -R 1089:localhost:1089 for several days, I have noticed this. I wonder what processes is 2494/sshd connected to, as no counterparty ...
-5
votes
1answer
40 views

Is it possible to have file with no name? [on hold]

I recently listen to the argument at school. Two people were arguing if it's possible to have a file without a name. But I didn't wait for the end of it. So I'm asking, it's possible to have a file ...
-1
votes
0answers
20 views

Monitor traffic with endpoints [on hold]

I want to monitor traffic on my linux machine with metadata (remote IP, port) like ntop does, but a bit more like webalizer or cacti over time. vnstat does not provide connection metadata, but ...
0
votes
2answers
23 views

Running startup shell script for ruby application as other user (not root)

I have installed RVM using 'user01' on Ubuntu 14.04 and user01 can start my rails application as expected. I, however, want to start this application following system start-up. I am trying to use the ...
1
vote
1answer
23 views

How to configure an additional BIND instance for a domain already described by other public name servers?

Background I have a small virtual server hosted by my provider and there I have configured a relatively simple combination of postfix, dovecot and roundcubemail (backed by nginx) that works OK. I ...
0
votes
0answers
4 views

linux: how to troubleshoot forwarded port? [migrated]

My home internet connection has a static IP address (eg: 123.123.123.123) I have configured my router to forward port 9000 to an internal host (192.168.1.101). That host is running Ubuntu 14-04. ...
-1
votes
0answers
23 views

Connection failed to MySQL server? [on hold]

My website runs on a cPanel server that I have root access to. About once every 2-3 hours I get an error message saying that the website can't connect to my MySQL database. The website and database ...
1
vote
2answers
58 views

screen command process id

First of all sorry for my bad english and i am new at linux. When i do this, it can write process id to pid file start () { echo -n "Starting someserver.jar: " java -jar ...
0
votes
0answers
17 views

Cannot query UDP services

I run a couple UDP services, one including Teamspeak 3. Unfortunately, I am unable to query either of these UDP services (I cannot connect to the Teamspeak 3 server) besides the TCP based stuff, ...
-1
votes
1answer
32 views

init.d script getting error

First of all sorry for my bad english Ok, i wrote a init.d script and i don't know its true or false (i am new at this things) #!/bin/sh . /etc/init.d/someserver start () { echo -n $"Starting ...
0
votes
2answers
38 views

How to configure ssh access for an unattended linux-distro ISO image for local development env similar to accessing cloud service VM instances?

I configured Packer.io to build unattended iso installs of various debian-derived distros to VMware fusion. As i configure the VMs manually for ssh access, it times out and the build artifacts created ...
-5
votes
0answers
49 views

Slow site, most time spent Blocking/Connecting [on hold]

My site is based on user-submitted content, meaning that users can upload images, etc. The problem is, my website loads extremely slowly on first load (before it caches). For example, here is the ...
12
votes
1answer
97 views

How do I make sec ignore a timestamp properly

I have a rule that is set up like so; In /etc/sec/rules.d I have; type=SingleWithSuppress ptype=regexp pattern=(\S+) sshd\[\d+\]: PAM \d+ more authentication failures\; logname=.* uid=.* euid=.* ...
0
votes
0answers
7 views

increasing shrink space in windows 7 [migrated]

I am trying to install Linux on a machine that is currently running windows 7 home edition. I want to keep windows 7 and install windows in a partition. So I went to Disk Management, right-clicked ...
0
votes
0answers
15 views

Connect to Oracle Linux 7 server via VNC from Windows 7 [on hold]

I'm in the process of setting up a small Oracle DB server, and am trying to figure out how to connect remotely to it. So far I've gotten to the point where I can SSH in to it, and can connect to ...