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From Mukesh <regmi.muk...@gmail.com>
Subject dev-mapper-centos\x2droot.device error on cloustack created VM
Date Sun, 23 Jul 2017 03:58:37 GMT
Hi,
       getting the dev-mapper-centos\x2droot.device error on cent7
installed VM on cloud stack. Could someone help to resolve it.

Regards,
Mukesh


On Wed, Jul 19, 2017 at 8:48 PM, Simon Weller <sweller@ena.com.invalid>
wrote:

> MTU path discovery uses  ICMP type 3 code 4 messages. If your routers are
> blocking all ICMP inbound from the internet, they will never received the
> messages and won't know that an upstream router needs the packet to be
> re-transmitted with a smaller MTU size.
>
> Does that make sense?
>
>
> - Si
>
> ________________________________
> From: Taylor <tschneider@live.com>
> Sent: Wednesday, July 19, 2017 9:37 AM
> To: users@cloudstack.apache.org
> Cc: Taylor
> Subject: Re: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
>
> I don't think ICMP is being blocked. I can ping google.com from inside
> the NAT'd LAN.
>
> Am I misunderstanding what you said?
>
> ________________________________
> From: Simon Weller <sweller@ena.com.INVALID>
> Sent: Wednesday, July 19, 2017 10:04 AM
> To: users@cloudstack.apache.org
> Subject: Re: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
> So if your routers are blocking all ICMP, they will break MTU path
> discovery. See this: https://en.wikipedia.org/wiki/Path_MTU_Discovery
>
> Path MTU Discovery - Wikipedia<https://en.wikipedia.org/wiki/Path_MTU_
> Discovery>
>
> en.wikipedia.org
> Path MTU Discovery (PMTUD) is a standardized technique in computer
> networking for determining the maximum transmission unit (MTU) size on the
> network path between two ...
>
>
>
>
>
>
>
>
> ________________________________
> From: Taylor <tschneider@live.com>
> Sent: Wednesday, July 19, 2017 8:57 AM
> To: users@cloudstack.apache.org
> Cc: Taylor
> Subject: Re: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
>
> Hi Simon,
>
> I a not sure about the networking problem you mentioned. I will google
> that and if you have any quick ways to check let me know.
>
> As for the double NAT, the answer is yes. My network is configured as
> follows:
>
> Internet -- 1000MBps router -- 100Mbps router -- Hypervisor / Cloudstack /
> NFS
>
> As far as I am aware the routers are acting as firewalls for incoming
> traffic (they are simple home routers) but should not impact outgoing
> traffic.
>
> Thanks,
>
> Taylor
>
> ________________________________
> From: Simon Weller <sweller@ena.com.INVALID>
> Sent: Wednesday, July 19, 2017 9:41 AM
> To: users@cloudstack.apache.org
> Subject: Re: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
> Taylor,
>
>
> To me this sounds like you might have some sort of networking problem,
> such as MTU path discovery being broken and some device in the path setting
> a do not fragment flag.
>
> Can you give us a bit more info about how you are connected to the
> internet as Dag has suggested? Is there a firewall in front of your switch?
> Are you double NATing the traffic?
>
>
> - Si
>
>
>
>
> ________________________________
> From: Taylor <tschneider@live.com>
> Sent: Wednesday, July 19, 2017 8:09 AM
> To: users@cloudstack.apache.org
> Cc: Taylor
> Subject: RE: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
> forgot to cc myself
>
>
> -------- Original message --------
> From: Taylor <tschneider@live.com>
> Date: 7/19/17 08:08 (GMT-06:00)
> To: users@cloudstack.apache.org
> Subject: RE: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
> Hey Dag,
>
> I have tried both. The health check is good and the vm behavior does not
> change after recreation.
>
> I think the problem is the network latency or the vm's resource allocation.
>
> The download will work but a connection timeout occurs every 20MB so it
> needs to be done in pieces. The hypervisors which hosts the vm is able to
> download without a problem.
>
> I am on a 100mbps switch. In the past I was using a 1000mbps.
>
> Any other thoughts on debug or work around?
>
> I think adding retry logic should be a simple fix?
>
>
> -------- Original message --------
> From: Dag Sonstebo <Dag.Sonstebo@shapeblue.com>
> Date: 7/19/17 03:11 (GMT-06:00)
> To: users@cloudstack.apache.org
> Subject: Re: Cloudstack 4.9 CentOS Template failure - Connection Reset
>
> Hi Taylor,
>
> This is most likely an issue with your environment rather than a bug. Take
> a look at your public network and how that is connected to the internet.
> You have to let CloudStack pull down the template, it’s difficult to
> manually populate this.
>
> A couple of other things to try:
> - recreate the SSVM – simply delete it and CloudStack will generate a new
> one.
> - from internally in the SSVM you can also run the SSVM check script,
> which will do some basic health checks for you:
>
> root@s-2-VM:~# /usr/local/cloud/systemvm/ssvm-check.sh
> ================================================
> First DNS server is  8.8.8.8
> PING 8.8.8.8 (8.8.8.8): 48 data bytes
> 56 bytes from 8.8.8.8: icmp_seq=0 ttl=53 time=24.146 ms
> 56 bytes from 8.8.8.8: icmp_seq=1 ttl=53 time=22.320 ms
> --- 8.8.8.8 ping statistics ---
> 2 packets transmitted, 2 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 22.320/23.233/24.146/0.913 ms
> Good: Can ping DNS server
> ================================================
> Good: DNS resolves download.cloud.com
> ================================================
> nfs is currently mounted
> Mount point is /mnt/SecStorage/a833f5f1-1c6d-3e54-9a55-1fc9b7875c54
> Good: Can write to mount point
> ================================================
> Management server is 10.10.45.2. Checking connectivity.
> Good: Can connect to management server port 8250
> ================================================
> Good: Java process is running
> ================================================
> Tests Complete. Look for ERROR or WARNING above.
>
> Regards,
> Dag Sonstebo
> Cloud Architect
> ShapeBlue
>
> On 19/07/2017, 05:29, "Taylor" <tschneider@live.com> wrote:
>
>     Hello,
>
>
>     I am experiencing an issue while trying to download the CentOS
> template.
>
>
>     It seems the connection is timing out and then failing.
>
>
>     To debug I logged into the SSVM and tried running a wget from the nfs
> directory mounted on that vm. This also failed due to connection reset.
>
>
>     Wget will eventually succeed if i use retry logic as follows:
>
>
>     wget http://download.cloud.com/templates/builtin/centos56-
> x86_64.vhd.bz2 --read-timeout=10
>
>
>     Using this setting the download will complete in pieces after multiple
> timeouts (logs below).
>
>
>     Is there a work around to add retry logic? Can I manually download and
> add the template to the database and restart the service? How can I file a
> bug report?
>
>
>     Thanks,
>
>
>     Taylor
>
>
>     ============================================================
> =================
>
>     LOGS:
>
>     ============================================================
> =================
>
>     root@s-103-VM:/mnt/SecStorage/5d8e791e-01cc-3d7c-84d8-
> f469944056e0/template/tmpl/1/5# wget http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2 --read-timeout=10
>     --2017-07-19 03:25:10--  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Resolving download.cloud.com (download.cloud.com)... 54.231.81.40
>     Connecting to download.cloud.com (download.cloud.com)|54.231.81.40|:80...
> connected.
>     HTTP request sent, awaiting response... 200 OK
>     Length: 374730926 (357M) [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     19% [============================>
>
>         ] 74,734,204  --.-K/s   in 97s
>
>     2017-07-19 03:26:55 (756 KB/s) - Read error at byte 74734204/374730926
> (Connection timed out). Retrying.
>
>     --2017-07-19 03:26:56--  (try: 2)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|54.231.81.40|:80...
> failed: Connection timed out.
>     Resolving download.cloud.com (download.cloud.com)... 52.216.81.16
>     Connecting to download.cloud.com (download.cloud.com)|52.216.81.16|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 299996722 (286M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     24% [+++++++++++++++++++++++++++++======>
>
>        ] 93,094,824  --.-K/s   in 24s
>
>     2017-07-19 03:28:23 (740 KB/s) - Read error at byte 93094824/374730926
> (Connection timed out). Retrying.
>
>     --2017-07-19 03:28:25--  (try: 3)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|52.216.81.16|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 281636102 (269M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     29% [++++++++++++++++++++++++++++++++++++======>
>
>       ] 112,111,876 --.-K/s   in 26s
>
>     2017-07-19 03:29:23 (702 KB/s) - Read error at byte
> 112111876/374730926 (Connection timed out). Retrying.
>
>     --2017-07-19 03:29:26--  (try: 4)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|52.216.81.16|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 262619050 (250M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     34% [+++++++++++++++++++++++++++++++++++++++++++=======>
>
>       ] 130,790,615 --.-K/s   in 26s
>
>     2017-07-19 03:30:23 (712 KB/s) - Read error at byte
> 130790615/374730926 (Connection timed out). Retrying.
>
>     --2017-07-19 03:30:27--  (try: 5)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|52.216.81.16|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 243940311 (233M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     49% [+++++++++++++++++++++++++++++++++++++++++++++++++++====================>
>                                                                          ]
> 185,802,362 --.-K/s   in 49s
>
>     2017-07-19 03:31:23 (1.08 MB/s) - Read error at byte
> 185802362/374730926 (Connection timed out). Retrying.
>
>     --2017-07-19 03:31:28--  (try: 6)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|52.216.81.16|:80...
> failed: Connection timed out.
>     Resolving download.cloud.com (download.cloud.com)... 52.216.225.48
>     Connecting to download.cloud.com (download.cloud.com)|52.216.225.48|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 188928564 (180M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     60% [++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++================>
>                                                         ] 226,947,877
> --.-K/s   in 32s
>
>     2017-07-19 03:33:11 (1.21 MB/s) - Read error at byte
> 226947877/374730926 (Connection timed out). Retrying.
>
>     --2017-07-19 03:33:17--  (try: 7)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|52.216.225.48|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 147783049 (141M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     65% [+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++++++++++++++++++++++++++++++======>
>                ] 247,259,880 --.-K/s   in 28s
>
>     2017-07-19 03:33:46 (697 KB/s) - Read error at byte
> 247259880/374730926 (Connection timed out). Retrying.
>
>     --2017-07-19 03:33:53--  (try: 8)  http://download.cloud.com/
> templates/builtin/centos56-x86_64.vhd.bz2
>     Connecting to download.cloud.com (download.cloud.com)|52.216.225.48|:80...
> connected.
>     HTTP request sent, awaiting response... 206 Partial Content
>     Length: 374730926 (357M), 127471046 (122M) remaining
> [binary/octet-stream]
>     Saving to: `centos56-x86_64.vhd.bz2'
>
>     100%[+++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +++++++++++++++++++++++++++++++++++++++++===================
> ===============================>] 374,730,926 1010K/s   in 2m 10s
>
>
>
>
>
> Dag.Sonstebo@shapeblue.com
> www.shapeblue.com<http://www.shapeblue.com>
> 53 Chandos Place, Covent Garden, London  WC2N 4HSUK
> @shapeblue
>
>
>
>


-- 
Best Regards,
Mukesh.R

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