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

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121 views

Why doesn't “timedatectl list-timezones” list ALL timezones?

Why does timezonectl not list all timezones available? $ timedatectl ⋮ Timezone: UTC (UTC, +0000) ⋮ $ timedatectl list-timezones | grep -i utc -no output- $ timedatectl list-timezones | wc -...
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562 views

How to use systemd-firstboot.service?

I'm making an image of Debian Jessie. On boot the system has no /etc/machine-id file. This causes some problems with the journald that doesn't start. I've found that in the systemd repo: # This ...
2
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15 views

What is the value shown for memory graph in XenCenter?

I would like to ask question to people in this community about Xen Center. I use Xen 6.5 in production environment. However, I quite don't understand the value shown in memory graph of "Performance" ...
2
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32 views

How do I view a Rackspace backup circa 2013?

I was a Rackspace customer until 2013. When I shut down my server, I had them send me a backup of it on a hard drive. Recently I had someone ask for something on that server, so I got the hard drive ...
2
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106 views

Why does ausearch skip entries?

I am trying to use the ausearch tool search my auditd logs for specific entries. The problem is that most of the entries in audit.log appear to be unsearchable. Searching with matching parameters ...
2
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301 views

how do I plan partitions for LUKS encryption of a CentOS 7 server?

A CentOS 7 web server needs encryption at rest. I would like to use LUKS encryption for this, but I need direction to plan how. Can I use LUKS encryption to encrypt the entire drive as one unit on a ...
2
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36 views

Varnish failing intermittently for no obvious reason

For the last few years we have been running Varnish as a cache and load balancer in front of several apache servers serving several thousand websites. We also use monit to ensure that if varnish ...
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231 views

Poweredge 2850 linux USB boot

I'm fairly new to configuring servers. I've done a few on basic desktops, but this Dell Poweredge 2850 is a whole different story. So please bare with me. I've made a bootable usb for Centos 6.5 OS ...
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626 views

Wrong filename encoding/decoding when downloading recursively with wget

I'm downloading files from a remote directory recursively using wget and whoever created the folders and files, used special characters such as è or Ó, when I download a single specificating the full ...
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18 views

Can 'or' logic be used in UDEV for mounting drive with unique UUIDs?

We do a back-up to a LaCie external rugged drive. The drive is then swapped with it's twin in the safe deposit box. While the drives have different serial numbers, for the servers purposes they are ...
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314 views

qemu-img VHD to raw image convert results in bad geometry:

Is anyone else able to reproduce this? Using StarWind V2V Image Converter on Windows, I'm able to get a valid disk.img file, so the source image.vhd is clean (pulled down from rackspace). Is this a ...
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377 views

Usermod -aG vs gpasswd -a as a best practice

I am aware that usermod -g is not best practice from many posts like this however they normally explain the usermod should not be used as it changes the primary group of a user. These posts dont seem ...
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161 views

Many gettimeofday in Apache 2.4 + fcgid + centos 6.6 - Long Wait time for static files

When i perform a strace on apache process, i see many gettimeofday before & after GET request, even when Apache returns a static file like an image file. It results in a long downtime period ...
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50 views

Get statuses of network printers

we are tasked with finding exactly how many pages were printed by all IP printers on a fairly large network, and then doing a lot of things with that data. There are about 15 different printer ...
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182 views

Use of CPUQuota in systemd

I am trying to put a hard limit in CPU usage for a dd command . I have created the following unit file [Unit] Description=Virtual Distributed Ethernet [Service] ExecStart=/usr/bin/ddcommand ...
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630 views

Problems on mounted NFS: 'No such file or directory' but files and directories exist

So we are having a medium-sized NFS4 storage server running CentOS 6.6 exporting an NFS share /storageDat (which is the NFS root, with two RAID volumes bound in there: ./dat1 and ./dat2); Export ...
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728 views

php generated css no output, net::ERR_INCOMPLETE_CHUNKED_ENCODING

I am running apache on an ubuntu installation. Several webapps are running on the same server. I installed a new app, which required the pdo-sqlite extension to be installed. Now my server is ...
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179 views

Move process across NUMA system

I am running many multi-threaded processes on a larger NUMA system with dozens of sockets. The memory access across different nodes is very slow, so I restrict each process to one socket and let it ...
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76 views

Dovecot and virtual domains with different namespaces

I've got dovecot 2.1.7 setup with virtual domains and now would like to have different public namespaces for each of the virtual domains. E.g. workdomain.com -> INBOX (private namespace) -> ...
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189 views

How efficient is the tac command on large files

The taccommand (catreversed) can be used to read a file backwards, just like cat reads it rom the beginning. I wonder, how efficient this is. Does it have to read the whole file from the beginning and ...
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263 views

OpenLDAP TLS - test results in Bad file descriptor

I have set up an openldap server including tls on ubuntu 14.04 following this guide. While testing the connection, I get results that I can not find an explanation for. ldapsearch -xLLL -Z -W -D cn=...
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149 views

firewall-cmd forward rules for interface with multiple ips

I'm looking for a way with firewall-cmd or another command to do the following. An incoming public interface has multiple ip addresses bound to it. How can I forward ports only for one of the ip ...
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333 views

Linux bridge not answering arp packets

I'm trying to setup a test scenario regarding linux bridges for which I need a full virtual IP stack. Basically, I'd like to simulate the network between a VM (or container) and its host, just without ...
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324 views

pg_basebackup automatic password

I have a master and slave database setup. The master database is on a secure network and only the postgres port is allowed through to the slave database server. The database needs to be secured and ...
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271 views

LVM2 Thin pool transaction_id mismatch

I believe we trashed some LVM thinpool metadata while moving 2 volume groups to a different machine. We now trying to reactivate the volume groups on the original machine. The physical volumes, volume ...
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193 views

Linux NFS server refuses blocking locks

So I have this problem. This horrible, awful problem. I have a set of Linux NFS servers (in a NFS/CIFS cluster using CTDB) that refuse locks… only when the lock is blocking. If it's a non-blocking ...
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81 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 ...
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65 views

IPsec - strange behavior

I have set up site-to-site ipsec connection between linux(debian) and mikrotik router. The tunnel is up linux configuration: config setup interfaces=%defaultroute keep_alive=60 ...
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1k views

Network Layer 7 Deep Packet Inspection linux solution that isn't a all-in-one distro?

Overview: I have software that has our Edge/DNS servers hardcoded into them, DNS queries returned from DNS servers are not being masked properly. I need the DNS entries that are returned from BIND ...
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137 views

yum-complete-transaction in a crazy loop

I was trying to update a server that I have with yum update and it aborted because the server ran out of memory. I killed off a few processes that were not needed and ran yum-complete-transaction but ...
2
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70 views

php-fpm: Maintain php_mod logging format

I recently switched all my lab servers from apache pre_fork/mod_php to apache worker/fcgi/php-fpm, and after getting everything set-up correctly, I noticed one last issue; php-fpm is adding it's own ...
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1k views

Creating redundant IPSec connections using OpenSwan

I have a linux (netkey) instance with openswan installed, the instance has two connection to the same IPSec peer that needs to act as redundant connections. both connections' properties are the same (...
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436 views

LDAP authentication, pam_mkhomedir and NFS automounted homes

We currently have a setup (running on Ubuntu 14.04 LTS) with mixed LDAP/NIS authentication and automounted home directories from several servers (with the auto.home map distributed over NIS). ...
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155 views

Setting quotas from a Linux client on a SmartOS (OpenSolaris) based ZFS server

I have a SmartOS (an OS based on OpenSolaris) server running a few virtual machines. One of the ZFS volumes is shared as an NFS volume and mounted on one of the VMs which is running Debian wheezy. ...
2
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180 views

Samba: Authenticate only local accounts over AD?

I have a samba server where I create all the linux accounts and corresponding SMB accounts via a application I built. I manage all the permissions for all of our shares via ACL's also using the ...
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395 views

Why “scope link” ipv6 address can be pinged via interfaces which they are not active on

[root@2_01 ~]# /sbin/ip -6 addr show pubeth0 inet6 2001:1::6/64 scope global inet6 2001:1::1/64 scope global inet6 fe80::20c:29ff:fe69:f9e8/64 scope link [root@v2_01 ~]# /sbin/ip -6 addr show ...
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399 views

runnning systemd without PrivateTmp, PrivateNetwork and PrivateDevices (in docker - unprivileged mode)

I am happily running systemd inside a docker container, however, it requires CAP_SYS_ADMIN in order to dynamically create private tmp mounts. I have attempted to disable the PrivateTmp, ...
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257 views

actual disk iops and write merging

/dev/sdb has LVM and exposes a single logical volume, dm-0. While writing to dm-0, /proc/diskstats reports: # of writes completed sdb 29646717 dm-0 131315099 # of writes merged: sdb 101668283 dm-0 ...
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588 views

BIND/Linux limiting concurrent UDP connections

I'm seeing an issue where the number of concurrent UDP connections to BIND appears to be getting limited. I've previously increased recursive-clients in named.conf and I've increased the socket limit ...
2
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0answers
53 views

PHP APC cannot increase cache above 32m

apc.shm_size I set it to 128M I have also try 128 (without M) But It always 32M :( /proc/sys/kernal/shmmax is set to 134217728
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226 views

Linux (Debian 7 x64) swapping activity despite lots of free memory

Yes, I have reduced vm.swappiness a lot: % sysctl -a | grep swap vm.swappiness = 1 Memory is mostly free: % cat /proc/meminfo | head MemTotal: 8070592 kB MemFree: 2619580 kB ...
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342 views

Ubuntu 12.04 crash analysis - strange binary data on all open files at the moment of crash

A couple of hours ago we got a system crash on Ubuntu 12.04. We checked all the log files and there is nothing suspicious to blame to. Last stuff that was logged was some dovecot activity. There are ...
2
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0answers
153 views

How do I get the file name corresponding to an NFS file handle on Linux?

I have tcpdump output of some NFS traffic, it shows which file handles are being read or written. I'd like to know which files they correspond to. There's got to be an existing tool which will list ...
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692 views

squid transparent proxy https

i hope someone can help me. i have this problem: squid is running as a ssl transparent proxy, and at the moment it's receiving all the traffic with these two iptables rules: iptables -t nat -A ...
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2k views

Proxmox - Port forwarding from Host to Guest

I'll just quickly start by apologising due to my lack of knowledge in Linux networking and I appreciate all the help I'll receive from any patient users willing to help a newbie. I have a Linux (...
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107 views

Lots and lots of kernel log entries: iint_free: readcount: -1, iint_free: writecount: 1

I am getting tons of log entries of the form Mar 2 00:44:10 SRV123 kernel: iint_free: readcount: -1 Mar 2 00:44:10 SRV123 kernel: iint_free: writecount: 1 Mar 2 00:44:10 SRV123 kernel: iint_free: ...
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878 views

How to mount share in pam_mount.conf.xml depending of OU

I have a Microsoft Windows domain and I want to add the ubuntu machines with Likewise-Open. There is no problem with that, but in my windows machines I have a GPO that mount a net share depending of ...
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54 views

Change the logical volume

I am quite new this snapshot process. Let, I have three logical volumes as A, B, C. I worked on logical volume C. But accidentally when I restart the system, it goes to the snapshot A. How can I ...
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2k views

Huge CPU usage by “host” command on my web server (ubuntu, apache )

Suddenly my website became very slow. When I login into my sever with ssh, and checked the cpu utilization, I found host command was utilizing more than 80% cpu. The problem was solved by a server ...
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184 views

RAID1 disks “forked”, now duplicate

I have got a server hosted by OVH, which is configured to have a soft RAID1 array, /dev/md0, that holds a LVM PV. There is another /dev/md1 array, which was supposed to be the /boot, but which is ...