Linux Kernel Virtual Machine (KVM) Vs Xen
Dec 12, 2008
I am currently researching the options open to me for Virtualisation, the two main ones I have seen are Xen or KVM.
I mainly use CentOS (RHEL), but have read that the version of Xen with it is very old, broken and unstable. KVM isn't included in the kernel that ships with CentOS, as it is too old, apparently it was first featured in Kernel v2.6.20. There isn't likely to be an update till RHEL6, which is due for release first quarter of 2010. I can't wait over a year, so need to find another Distro for use as the Host OS/Hypervisor.
I have built a pretty powerful server, it has an Intel Xeon 3230 which has VT - so I might be better off using KVM over Xen. I am going to collocate this server, so realistically I can make this decision only once - as it would be a PITA to re-install a host Linux distro remotely.
I did a search on distrowatch for distros with the latest version of the kernel, and Slackware came up as being just one minor version behind the most current (v2.6.27.7).
Now this distro is very mature, so should be a fairly safe bet, but it is a 32bit version and can't host 64bit VMs. I have 8GB of ram so want to be able to use it all, and offer the choice of 32/64bit VMs. So that's that out of the window.
I have used Arch Linux on and off for a couple of years as a workstation OS, but because it is so bleeding edge, when pacman updates it can break itself. But I suppose if I just use it as the Host OS, and never let it update/reboot, then it won't break. It should be fairly lightweight and stable, as I will be installing the bare minimum packages. I have a management card, so if the server fails to boot, then I can still remote in to fix it.
If I do want to update the kernel, is it possible to update without rebooting? I think it is somehow... unless I can just reboot during an unused time at 3am or something.
As you can tell I am leaning towards KVM on Arch Linux (x86_64). Is this a good plan?
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Sep 24, 2008
I've started looking into KVM to possibly to run alongside or even to end up replacing our current Xen infrastructure. The fact that it's built into the mainstream linux kernel is very appealing.
Are there any Control panels/basic frontends for this at the moment to allow users to Reboot/Reimage their VM's? At the moment its looking as though we would need something inhouse or custom developed
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Oct 15, 2007
Can I install say, VMWare on a VPS and use it the same way as if it were installed on an OS running on the physical hardware?
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Jul 18, 2008
I've set up a website using a no ip-account, nothing fancy or business-oriented, and I have it working this way:
no-ip(port 80 redirect to port 6500)->router(redirect port 6500 to pc2 with ip 192.168.1.3)->pc2(vmware server redirects port 6500 to virtual machine with ip 192.168.60.100, which is running an asp .net server serving on port 6500)
The router does not forward any port other than that one, but I would like to know if this has any risk for the other machines on the lan.
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Aug 8, 2008
how you monitor the traffic of each individual VPS on your dedicated servers?
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Nov 18, 2008
Can someone suggest me good Free virtual machine software? To be able to run on linux platform, and able to run windows, linux, unix and bsd systems from ISO files.
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Sep 19, 2007
I want to be able to clone a existing virtual machine image(whether it's openvz or xen) and deploy it.
It's sort of like Amazon EC2.
I want to set up a virtual machine image once. Then deploy it(it doesn't matter whether it's on the same physical machine or not) to a new machine or overriding existing image on a existing machine. It's fine that the VPS provider charge me a monthly charge for every virtual machine I deploy.
This way, I only need to maintain one master virtual machine.
It'd be even better if I can export a image to my own machine, modify it locally, then upload it for deployment.
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Jul 25, 2014
I have an Apache server running on a virtual machine and I want to be able to access the pages it serves from a browser running on the host OS.
I am using OracleVM virtualbox as my VM platform.
I am using windows 7 as my host OS.
I am using ubuntu as my guest OS.
I have managed to set up a virtual host so that it works from browsers running in the guest OS (ubuntu)
But I cannot get it to serve these pages to a browser running in the host OS windows.
The config file in the apache2/sites-available and apache2/sites-enabled has the following config for the virtual host I am trying to access.
<VirtualHost *:80>
ServerAdmin webmaster@localhost
ServerName testsite
DocumentRoot /var/newserver
<Directory />
Options FollowSymLinks
[Code] ....
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Mar 20, 2015
I would like to create VMM template with installed plesk panel 12.0.18
But after I executed sysprep plesk panel didn't work.
All services, application pool work, but when I try to connect https://localhost:8443 I get an error "The page can't be displayed"...
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Jan 16, 2007
At 1:25am last night I received this message and our server locked up:
Jan 16 01:25:02 host kernel: Unable to handle kernel paging request at virtual address 00361fa8
Jan 16 01:25:02 host kernel: printing eip:
Jan 16 01:25:02 host kernel: c0177f86
Jan 16 01:25:02 host kernel: *pde = 3cc79067
Jan 16 01:25:02 host kernel: Oops: 0000 [#1]
Jan 16 01:25:02 host kernel: Modules linked in: md5 ipv6 parport_pc lp parport ipt_TOS ip_conntrack_ftp ip_conntrack_irc ipt_REJECT ipt_limit ipt_multiport ipt_state autofs4 sunrpc ipt_LOG iptable_filter iptable_mangle iptable_nat ip_conntrack ip_tables dm_mirror dm_mod button battery ac ohci_hcd ehci_hcd r8169 8139too mii floppy ext3 jbd
Jan 16 01:25:02 host kernel: CPU: 0
Jan 16 01:25:02 host kernel: EIP: 0060:[<c0177f86>] Not tainted VLI
Jan 16 01:25:02 host kernel: EFLAGS: 00010202 (2.6.9-22.EL)
Jan 16 01:25:02 host kernel: EIP is at __link_path_walk+0xa77/0xd98
Jan 16 01:25:02 host kernel: eax: 00361f80 ebx: 00000000 ecx: f3138e60 edx: f3138e5c
Jan 16 01:25:02 host kernel: esi: f7b4ea0c edi: 01b07b37 ebp: f3138f0c esp: f3138e3c
Jan 16 01:25:03 host crond(pam_unix)[27321]: session closed for user root
Jan 16 01:25:03 host kernel: ds: 007b es: 007b ss: 0068
Jan 16 01:25:03 host kernel: Process dataskq (pid: 27325, threadinfo=f3138000 task=f403d220)
Jan 16 01:25:03 host kernel: Stack: f3138f58 00000000 f3138e90 c018109b 00000001 00000000 f4e0f00a c18c8c80
Jan 16 01:25:03 host kernel: f22e0ef8 01b07b37 00000004 f4e0f006 f3138f0c f3138f0c f4e0f000 f4e0f000
Jan 16 01:25:03 host kernel: 00000000 c01782e8 f7c609b8 c18c8e00 00000000 00000000 00000000 00000001
Jan 16 01:25:03 host kernel: Call Trace:
Jan 16 01:25:03 host kernel: [<c018109b>] dput+0x33/0x423
Jan 16 01:25:03 host kernel: [<c01782e8>] link_path_walk+0x41/0xb9
Jan 16 01:25:03 host kernel: [<c01785e0>] path_lookup+0x104/0x135
Jan 16 01:25:03 host kernel: [<c0178725>] __user_walk+0x21/0x51
Jan 16 01:25:03 host kernel: [<c01729bc>] vfs_stat+0x14/0x3a
Jan 16 01:25:03 host kernel: [<c0172fc5>] sys_stat64+0xf/0x23
Jan 16 01:25:03 host kernel: [<c030f91f>] syscall_call+0x7/0xb
Jan 16 01:25:03 host kernel: Code: e8 46 f4 ff ff 8b 44 24 20 8b 70 20 31 c0 85 f6 0f 95 c0 85 44 24 10 0f 84 6f 02 00 00 8b 86 cc 00 00 00 85 c0 0f 84 61 02 00 00 <83> 78 28 00 0f 84 57 02 00 00 8b 44 24 1c 85 c0 74 03 ff 40 28
Jan 16 01:25:03 host kernel: <0>Fatal exception: panic in 5 seconds
Jan 16 01:25:06 host crond(pam_unix)[27320]: session closed for user root
-----------------------------------------------
Yesterday morning I received a similare message aswell as the server locking up:
------------------------------------------------
Jan 15 06:40:47 host kernel: Unable to handle kernel paging request at virtual address 00fe0dc8
Jan 15 06:40:47 host kernel: printing eip:
Jan 15 06:40:47 host kernel: c03074f2
Jan 15 06:40:47 host kernel: *pde = 3b25c067
Jan 15 06:40:47 host kernel: Oops: 0002 [#1]
Jan 15 06:40:47 host kernel: Modules linked in: md5 ipv6 parport_pc lp parport ipt_TOS ip_conntrack_ftp ip_conntrack_irc ipt_REJECT ipt_limit ipt_multiport ipt_state autofs4 sunrpc ipt_LOG iptable_filter iptable_mangle iptable_nat ip_conntrack ip_tables dm_mirror dm_mod button battery ac ohci_hcd ehci_hcd r8169 8139too mii floppy ext3 jbd
Jan 15 06:40:47 host kernel: CPU: 0
Jan 15 06:40:47 host kernel: EIP: 0060:[<c03074f2>] Not tainted VLI
Jan 15 06:40:47 host kernel: EFLAGS: 00010286 (2.6.9-22.EL)
Jan 15 06:40:47 host kernel: EIP is at __unix_remove_socket+0x14/0x4e
Jan 15 06:40:47 host kernel: eax: f7abb948 ebx: f5fe0280 ecx: f5fe0288 edx: 00fe0dc8
Jan 15 06:40:47 host kernel: esi: f5fe0280 edi: f76fccbc ebp: 00000000 esp: f6974f68
Jan 15 06:40:47 host kernel: ds: 007b es: 007b ss: 0068
Jan 15 06:40:47 host kernel: Process estate.cgi (pid: 10298, threadinfo=f6974000 task=f6870600)
Jan 15 06:40:47 host kernel: Stack: 00000000 c030775f f5fe0280 f5fe0280 00000000 f76fcc80 f76fccbc f7a7a780
Jan 15 06:40:47 host kernel: c02aae3a f76fccbc c18c8600 c02ab950 f65b4680 c0168e5a f65b4680 00000000
Jan 15 06:40:47 host kernel: f792ac80 f6974000 c0167763 00000003 09d6cec8 00000000 c030f91f 00000003
Jan 15 06:40:47 host kernel: Call Trace:
Jan 15 06:40:47 host kernel: [<c030775f>] unix_release_sock+0xf/0x19f
Jan 15 06:40:47 host kernel: [<c02aae3a>] sock_release+0x11/0x63
Jan 15 06:40:47 host kernel: [<c02ab950>] sock_close+0x26/0x2a
Jan 15 06:40:47 host kernel: [<c0168e5a>] __fput+0x55/0xee
Jan 15 06:40:47 host kernel: [<c0167763>] filp_close+0x59/0x5f
Jan 15 06:40:47 host kernel: [<c030f91f>] syscall_call+0x7/0xb
Jan 15 06:40:47 host kernel: Code: 89 c2 c1 ea 08 31 c2 81 e2 ff 00 00 00 89 16 89 fa 5b 89 d0 5e 5f c3 53 89 c3 83 78 0c 00 74 43 8d 48 08 8b 40 08 8b 51 04 85 c0 <89> 02 74 03 89 50 04 c7 41 04 00 00 00 00 8b 43 18 48 75 21 68
Jan 15 06:40:47 host kernel: <0>Fatal exception: panic in 5 seconds
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Jun 16, 2007
My server has been kernel panicking on and off irreguarly every 2 days or so since I upgraded to cPanel 11, I'm not entirely sure whether this was the cause however I've isolated the fact it is a kernel issue. I am running CentOS 4.5 and was running Kernel "2.6.9-42.0.8.ELsmp" however switched to the kernel I was running before (2.6.9-42.0.3.ELsmp) and the same issue is still cropping up.
I thought that it may be a memory addressing issue or the like, however from looking up the issue, several C programming forums seem to suggest dodgy applications, the memory usage on the server does always seem fairly low and loads are generally healthy so this would seem to be supported.
The logs before the server kernel panics are as so:
Quote:
Jun 16 17:40:01 buzz kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000010
Jun 16 17:40:01 buzz kernel: printing eip:
Jun 16 17:40:01 buzz kernel: c016563c
Jun 16 17:40:01 buzz kernel: *pde = 177b1001
Jun 16 17:40:01 buzz kernel: Oops: 0000 [#1]
Jun 16 17:40:01 buzz kernel: SMP
Jun 16 17:40:01 buzz kernel: Modules linked in: iptable_filter ip_tables md5 ipv6 autofs4 dm_mirror dm_mod button battery ac joydev ohci_hcd ehci_hcd snd_inte
l8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore 8139too mii ext3 jbd
Jun 16 17:40:01 buzz kernel: CPU: 0
Jun 16 17:40:01 buzz kernel: EIP: 0060:[<c016563c>] Not tainted VLI
Jun 16 17:40:01 buzz kernel: EFLAGS: 00010246 (2.6.9-42.0.3.ELsmp)
Jun 16 17:40:01 buzz kernel: EIP is at pipe_readv+0x28a/0x29e
Jun 16 17:40:01 buzz kernel: eax: 00000000 ebx: deaeb2e0 ecx: 00020002 edx: 0000001d
Jun 16 17:40:01 buzz kernel: esi: c9274f80 edi: bff0ed50 ebp: 0000006d esp: c9274f44
Jun 16 17:40:02 buzz kernel: ds: 007b es: 007b ss: 0068
Jun 16 17:40:02 buzz kernel: Process sim (pid: 31509, threadinfo=c9274000 task=dda210b0)
Jun 16 17:40:02 buzz kernel: Stack: 00000000 00000000 cd7ee06d 00000013 0000006d 00000001 deaeb2e0 c9274f80
Jun 16 17:40:02 buzz kernel: c30f2a80 c032dba0 c30f2a80 00000080 c9274fac c016566c c9274fac bff0edbd
Jun 16 17:40:02 buzz kernel: 00000013 c015af11 c9274fac bff0ed50 c30f2a80 fffffff7 bff0ed50 c9274000
Jun 16 17:40:02 buzz kernel: Call Trace:
Jun 16 17:40:02 buzz kernel: [<c016566c>] pipe_read+0x1c/0x20
Jun 16 17:40:02 buzz kernel: [<c015af11>] vfs_read+0xb6/0xe2
Jun 16 17:40:02 buzz kernel: [<c015b124>] sys_read+0x3c/0x62
Jun 16 17:40:02 buzz kernel: [<c02d47cb>] syscall_call+0x7/0xb
Jun 16 17:40:02 buzz kernel: Code: 20 01 00 00 b9 02 00 02 00 ba 1d 00 00 00 83 c0 34 e8 a3 53 00 00 58 83 7c 24 10 00 7e 15 8b 44 24 20 f6 40 1a 04 75 0b 8b
40 08 <8b> 40 10 e8 17 c5 00 00 8b 44 24 10 83 c4 24 5b 5e 5f 5d c3 83
Jun 16 17:40:02 buzz kernel: <0>Fatal exception: panic in 5 seconds
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Aug 17, 2007
I was wondering if anyone can help me out or point me to a guide that will allow me to to create a Windows 2003 x64 Virtual MAchine using VMWare server on a CentOS or Redhat installation.
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Mar 23, 2009
I am planning to get a Juniper firewall, but due to SSG140 has a maximum of 48,000 concurrent sessions per second, so it triggers me how do I measure the concurrent session of a linux server of the total throughput instead of just port 80?
OS: CentOS
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Jun 27, 2009
I have a dedicated machine collocated at some hosting provider and after a while (14 days or so, but timeframe is not constant) it hangs for no apparent reason. It happened 2 times already. Nothing in the logs (it logs everything), nothing at all.
Before the commission the machine was running for a month without any problems.
The first time it happened the tech guy plugged in monitor and keyboard and could not see anything on the display. Before that machine was not loaded with any traffic, nobody should have actually known it is there (except for some DNS traffic). It took some 20 days of uptime.
The second time it happened was yesterday, after some 15 days of uptime.
I suspect hardware malfunction because I have 2 "identical" (OS & progs, not the hardware) systems running without any problems. It is an HP DL380 G5 machine, the problematic one.
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Apr 17, 2009
how to manage different e-mail accounts in linux, we are moving a cpanel hosted account into a bare-linux machine.
I can get all the services setup, however the question remains how do I add different mailboxes with different domains?
Do I have to create a linux user for each mailbox?
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Oct 24, 2008
We have a domain portal controller for windows. All the machines in the n/w are connected to it. So, when ever an user enters the user name and password it gets authenticated from the domain portal controller. So, my login can be accessed anywhere in the netowrk.
Example : my login is sabarishks which can be used in any machine under this domain controller.
But, if the system is installed with both linux and windows only windows username will be authenticated using the domain controller. Whereas, the linux users will work with in the system using /etc/shadow file. Hope, I am clear so far.
The requirement is same as above. The authentication mechanism for linux should work as windows. When ever an user is entered with a username and passwd, it should get authenticated from domain controller.
I mean, the user created in a windows machine should be used for linux login also. More importantly, It should work in all systems.
Which technology can be used to do this? Samba,Ldap, NFs or what?
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Feb 23, 2008
Do we have to be concerned with this issue?
[url]
Is Centox 4x system included in the Kernel Flaw above?
Are all Linux servers at risk now?
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Jun 16, 2008
Programs compiled with the Intel C++ compiler run 20-30% (up to 450% in some rare cases) faster than their GCC counterparts.
I have successfully compiled MySQL 5, PHP 5, eAccelerator and nginx with ICC 10.1.015. I was wondering, if anyone has compiled the linux kernel with icc? There are some linux vendors who supply icc compiled kernels, and there are some docs on intels site about compiling the kernel with icc... so it's doable.
But I want to know if anyone has done it on a VPS? What was your experience? Did the system run faster than before? Or did you face some weird situations?
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Sep 12, 2007
starting a GSP (Game Server Provider) within the next 4-6 months.
One big factor I will need to tackle is optimizing the linux kernel on CentOS for game servers.
This entails accelerating the kernel to allow for 1000fps in Counter strike and Counter Strike Source, as well as tailoring the kernel to provide very reliable server side fps.
My question is, what would be some good sources about possibly doing this, also how would I go about rebuilding the kernel, and is it worth learning how to do myself even though my knowledge is fairly minimal in Linux?
Also does anyone know of specifics about what I need to modify in order to do this.
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Mar 7, 2007
I have followed the process below:
Fedora Core 6
In a first step, the yum repository must be configured. The .repo file is available in Ingo Molnar's project directory [url].
# cd /etc/yum.repos.d
# wget http://people.redhat.com/mingo/realtime-preempt/rt.repo
Only the first time, yum must be called in installation mode:
# yum install kernel-rt
Later on, the command
# yum update kernel-rt
will update the kernel patch, should a more recent version be available. By default, the newly installed kernel is made the default boot kernel. The realtime-enabled kernel is, therefore, immediately active after the system has been restarted.
To check if enabled type:
# cat /proc/sys/kernel/kernel_preemption
1
Then this:
# cat /proc/sys/kernel/preempt_max_latency
39
As an debugging aid, the condition that led to this latency is also available:
# cat /proc/latency_trace
preemption latency trace v1.1.5 on 2.6.19-1.rt10.0001
--------------------------------------------------------------------
latency: 39 us, #2/2, CPU#0 | (M:rt VP:0, KP:0, SP:1 HP:1 #P:1)
-----------------
| task: posix_cpu_timer-3 (uid:0 nice:0 policy:1 rt_prio:99)
-----------------
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
/ ||||| | /
<...>-3 0...1 39us : __schedule (__schedule)
As a role of thumb, the maximum (worst-case) latency amounts to approximately 105 / clock frequency on an idle system. For example, a maximum latency of about 100 microseconds can be expected in a 1 GHz-CPU. If the value displayed is off by more than one order of magnitude, something is not working correctly.
Totally lost here! can someone explain this latency figure of 39, how do I know if this is good or bad figure?
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May 30, 2009
Few weeks ago my customer began to notice problem with server load.
I look to munin graphs and see this:
http://dl.getdropbox.com/u/252944/iowait/iowait-hr.png
iowait creates high performance degradation. There was no changes in server software & configuration. Sometimes server work very slow, count of apache processes is high - there is no any processes and scripts who can use a lot of hdd resources.
Sites located on customer server does not create high load, and not subjected to any attacks.
I received response from DC:
I did some research for this and it seems that other people has experienced similar issues and is reporting that it is a kernel bug have you ran yum update to receive the latest kernel if not you can try and update and see if that may resolve your issue.
CENTOS 5.2
Cpanel / WHM
Linux *** 2.6.18-92.1.22.el5PAE #1 SMP Tue Dec 16 12:36:25 EST 2008 i686 i686 i386 GNU/Linux
I try to run "yum update kernel" but it seems installed kernel is up to date.
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Jan 19, 2007
Is it safe to upgrade to the latest Linux kernel version 2.6.19.2 (released on January 10th, 2007) ? Is there any reported problems or have anyone faced issues after upgrading?
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Mar 29, 2007
we have one box in hivelocity.net that has been down so many times this month that we were forced to remove links to siteuptime where we were once so proud of having a 99.7% uptime for 3 years in theplanet.
syslog shows that just before crashing, these entries were made:
kernel: kernel BUG at mm/rmap.c:479
kernel: invalid operand:0000 [#1]
dmesg also shows this:
...
Brought up 2 CPUs
zapping low mappings.
checking if image is initramfs... it is
Freeing initrd memory: 482k freed
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xf9f20, last bus=1
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
mtrr: your CPUs had inconsistent fixed MTRR settings
mtrr: probably your BIOS does not setup all CPUs.
mtrr: corrected configuration.
...
i've googled these messages and they point to ram problems.
hivelocity.net claims to have done diagnostics on the box and that there were no problems reported.
they said this is a result of a sys configuration problem made by us.
any ideas?
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May 20, 2009
running centos/virtuozzo 2.6.18-028stab062.3
when i configure vmware it asks at one point for kernel header files. where would i find them to match the current kernel?
i asked at parallels forums but help there is very scarce. i checked openVZ repositories and they dont yet have headers for this version.
what are my options? i have one last windows machine left and want to run it in VMware.
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Apr 29, 2007
Last year I ordered a new server with Centos 4.3 and it had the kernel kernel 2.6.9-34.0.2ELsmp installed. It runned fine and I didn't update any packages since then.
Today I started getting a problem where both mysqld and kswapd0 uses very high amounts of CPU, spiking up to 100% and my memory usage is at 99% all the time. The problem seems exactly the same as the one mentioned in this thread.
In that thread the exact same kernel is said to be insecure and to cause this problem. I also came across a centOS bug that reports this problem with high cpu, mem usage and mysql & kswapd0 consuming all resources.
In the linked thread the person solved the problem by upgrading to kernel 2.6.9-42 using rpms but others recommended a newer kernel or a custom compiled kernel for CentOS.
Apparently when they used yum it said 34.0.2 was the latest kernel.
What should I do to upgrade the kernel, which version should i upgrade to, and where do I get it from? I won't be able to compile a custom kernel and I've only installed basic rpm packages before.
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Jan 12, 2009
i have a dedicated box with centos.. i wold like to install VmWare workstation and a virtual windows image in vmware program, and then i wold like to make remote desktop on windows image from vmware..
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Jul 2, 2007
I downloaded and installed this today thinking I'd build two VM sessions. one for CentOS and one for Ubuntu just to play around in.
But when I start a new session, choosing 'other' for the O/S, assigning plenty of RAM and hard drive space I still can't get to the setup.
Using the CentOS 5 iso I attempt to install. I get about 10 seconds into the load, and the system stops right after it sets the read only session on the kernel.
Using Ubuntu I can't even start. I choose to install text version, and i get two immediate CRC errors.
I've downloaded them both twice.
One other thing, I put my Vista disc in to test this (not an iso) and it ran fine.
Is it not possible to install linux from an ISO using this?
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Feb 13, 2015
I installed a new certificate, made it default, assigned it to the shared ip address and made the plesk panel use it.
The problem is we have 200 virtual hosts using the old certificate. Is there a way to reconfigure all those domains easily.
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Dec 21, 2008
What is the best linux version to run a vpn server over vps?
I'm a bit confused ,what's the best linux version if i want to have a vpn server ? Does Centos 5 work?
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Apr 1, 2015
I want to update CentOS from:
Code:
Version Parallels Plesk v12.0.18_build1200140606.15 os_CentOS 6
OS CentOS 6.6 (Final)
to CentOS 7.
What steps I need to do to install CentOS 7?
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May 21, 2015
I run a virtual server (Ubuntu 12.04, Plesk 12, Postfix 2.9.6) using plesk to manage multiple domains. The server address is server.domain1.com. I use plesk to also manage domain1.com regarding all services, including DNS and mail.
What I just found is that postfix sometimes issues the following warning:
server postfix/trivial-rewrite[7397]: warning: do not list domain server.domain1.com in BOTH mydestination and virtual_alias_domains
The essential part of my main.cf is:
myhostname = server.domain1.com
mydestination = localhost.$mydomain, localhost.localdomain, localhost
virtual_mailbox_domains = $virtual_mailbox_maps, hash:/var/spool/postfix/plesk/virtual_domains
virtual_alias_maps = $virtual_maps, hash:/var/spool/postfix/plesk/virtual
virtual_mailbox_maps = , hash:/var/spool/postfix/plesk/vmailbox
virtual_transport = plesk_virtual
And /var/spool/postfix/plesk/virtual_domains contains amongst others:
domain1.com domain1.com/
I do not have any issues with receiving or sending e-mails right now, but would like to get rid of the error message however.
Could it be the problem that postfix automatically sets mydomain to $myhostname with skipping the first part (i.e., mydomain is implicitly set to domain1.com)? Should I manually set mydomain to server.domain1.com instead? Any other recommendations? Since mydomain seems to be used in multiple options [URL] ..., I wonder what I might destroy with changing this? As all mail services run without any further troubles at the moment, I don't want to break this...
As I assume that quite some people use a plesk-based server to manage the domain to which the server itself belongs to, I would assume that there should be a general fix/check to updated mydomain accordingly?
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