<div dir="ltr">Hi! <div>first of all, thanks for the fast replies. I do appreciate that.</div><div><br></div><div>I did some more test trying to figure out the issue.</div><div>- Set UseDNS to "no" in sshd_config => Issue persists</div><div>- Installed and configured Telnet => Telnet login is slow as well</div><div><br></div><div>From the "top" or "auth.log"nothing specific popped up. I can sshd taking some cpu for a short while but nothing more than that.</div><div><br></div><div>Once logged in the VM is not too slow. CLI doesn't get stuck or similar.</div><div>One thing worthwhile to mention, it seems like the writing throughput on the disk is a bit slow: 67MB/s wrt around 318MB/s of another VM running on a "datacenter" Openstack installation.</div><div><br></div><div>The Cinder Volume docker is running on the Compute Host and Cinder is using the filesystem as backend.</div><div><br></div><div>BR</div><div>/Giuseppe</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 12 Jul 2019 at 17:41, Slawek Kaplonski <<a href="mailto:skaplons@redhat.com">skaplons@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
I suspect some problems with names resolving. Can You check if You have also such delay when doing e.g. “sudo” commands after You ssh to the instance?<br>
<br>
> On 12 Jul 2019, at 16:23, Brian Haley <<a href="mailto:haleyb.dev@gmail.com" target="_blank">haleyb.dev@gmail.com</a>> wrote:<br>
> <br>
> <br>
> <br>
> On 7/12/19 9:57 AM, Giuseppe Sannino wrote:<br>
>> Hi community,<br>
>> I need your help ,tips, advices.<br>
>> *> Environment <*<br>
>> I have deployed Openstack "Stein" using the latest kolla-ansible on the following deployment topology:<br>
>> 1) OS Controller running as VM on a "cloud" location<br>
>> 2) OS Compute running on a baremetal server remotely (wrt OS Controller) location<br>
>> 3) Network node running on the Compute host<br>
>> As per the above info, Controller and compute run on two different networks.<br>
>> Kolla-Ansible is not really designed for such scenario but after manipulating the globals.yml and the inventory files (basically I had to move node specific network settings from the globals to the inventory file), eventually the deployment works fine.<br>
>> *> Problem <*<br>
>> I have no specific issue working with this deployment except the following:<br>
>> "SSH connection to the VM is quite slow".<br>
>> It takes around 20 seconds for me to log into the VM (Ubuntu, CentOS, whatever).<br>
> <br>
> But once logged-in things are OK? For example, an scp stalls the same way, but the transfer is fast?<br>
> <br>
>> *> Observations <*<br>
>> * Except for the slowness during the SSH login, I don't have any<br>
>> further specific issue working with this envirorment<br>
>> * With the Network on the Compute I can turn the OS controller off<br>
>> with no impact on the VM. Still the connection is slow<br>
>> * I tried different type of images (Ubuntu, CentOS, Windows) always<br>
>> with the same result.<br>
>> * SSH connection is slow even if I try to login into the VM within the<br>
>> IP Namespace<br>
>> From the ssh -vvv, I can see that the authentication gets stuck here:<br>
>> debug1: Authentication succeeded (publickey).<br>
>> Authenticated to *****<br>
>> debug1: channel 0: new [client-session]<br>
>> debug3: ssh_session2_open: channel_new: 0<br>
>> debug2: channel 0: send open<br>
>> debug3: send packet: type 90<br>
>> debug1: Requesting <a href="mailto:no-more-sessions@openssh.com" target="_blank">no-more-sessions@openssh.com</a> <mailto:<a href="mailto:no-more-sessions@openssh.com" target="_blank">no-more-sessions@openssh.com</a>><br>
>> debug3: send packet: type 80<br>
>> debug1: Entering interactive session.<br>
>> debug1: pledge: network<br>
>> >>>>> 10 to 15 seconds later<br>
> <br>
> What is sshd doing at this time? Have you tried enabling debug or running tcpdump when a new connection is attempted? At first glance I'd say it's a DNS issue since it eventually succeeds, the logs would help to point in a direction.<br>
> <br>
> -Brian<br>
> <br>
> <br>
>> debug3: receive packet: type 80<br>
>> debug1: client_input_global_request: rtype <a href="mailto:hostkeys-00@openssh.com" target="_blank">hostkeys-00@openssh.com</a> <mailto:<a href="mailto:hostkeys-00@openssh.com" target="_blank">hostkeys-00@openssh.com</a>> want_reply 0<br>
>> debug3: receive packet: type 91<br>
>> debug2: callback start<br>
>> debug2: fd 3 setting TCP_NODELAY<br>
>> debug3: ssh_packet_set_tos: set IP_TOS 0x10<br>
>> debug2: client_session2_setup: id 0<br>
>> debug2: channel 0: request pty-req confirm 1<br>
>> Have you ever experienced such issue ?<br>
>> Any suggestion?<br>
>> Many thanks<br>
>> /Giuseppe<br>
<br>
— <br>
Slawek Kaplonski<br>
Senior software engineer<br>
Red Hat<br>
<br>
</blockquote></div>