Re: epair and vnet jail loose connection.

Reply: Johan Hendriks : "Re: epair and vnet jail loose connection."
In reply to: Kristof Provost : "Re: epair and vnet jail loose connection."
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From: Michael Gmelin <grembo_at_freebsd.org>
Date: Sun, 13 Mar 2022 00:17:07 UTC
I also gave it another go (this time with multiple CPUs assigned to the vm), still works just fine - so I think we would need more details about the setup.

Would it make sense to share our test setups, so Johan can try to reproduce with them?

-m

> On 13. Mar 2022, at 00:48, Kristof Provost <kp@freebsd.org> wrote:
> 
> 
> I’m still failing to reproduce.
> 
> Is pf absolutely required to trigger the issue? Is haproxy (i.e. can you trigger it with iperf)? 
> Is the bridge strictly required?
> 
> Kristof
> 
> On 12 Mar 2022, at 8:18, Johan Hendriks wrote: 
> For me this minimal setup let me see the drop off of the network from the haproxy server.
> 
> 2 jails, one with haproxy, one with nginx which is using the following html file to be served.
> 
> <!DOCTYPE html>
> <html>
> <head>
> <title>Page Title</title>
> </head>
> <body>
> 
> <h1>My First Heading</h1>
> <p>My first paragraph.</p>
> 
> </body>
> </html>
> 
> From a remote machine i do a  hey -h2 -n 10 -c 10 -z 300s https://wp.test.nl
> Then a ping on the jailhost to the haproxy shows the following
> 
> [ /] > ping 10.233.185.20
> PING 10.233.185.20 (10.233.185.20): 56 data bytes
> 64 bytes from 10.233.185.20: icmp_seq=0 ttl=64 time=0.054 ms
> 64 bytes from 10.233.185.20: icmp_seq=1 ttl=64 time=0.050 ms
> 64 bytes from 10.233.185.20: icmp_seq=2 ttl=64 time=0.041 ms
> <SNIP>
> 64 bytes from 10.233.185.20: icmp_seq=169 ttl=64 time=0.050 ms
> 64 bytes from 10.233.185.20: icmp_seq=170 ttl=64 time=0.154 ms
> 64 bytes from 10.233.185.20: icmp_seq=171 ttl=64 time=0.054 ms
> 64 bytes from 10.233.185.20: icmp_seq=172 ttl=64 time=0.039 ms
> 64 bytes from 10.233.185.20: icmp_seq=173 ttl=64 time=0.160 ms
> 64 bytes from 10.233.185.20: icmp_seq=174 ttl=64 time=0.045 ms
> ^C
> --- 10.233.185.20 ping statistics ---
> 335 packets transmitted, 175 packets received, 47.8% packet loss
> round-trip min/avg/max/stddev = 0.037/0.070/0.251/0.040 ms
> 
> 
> ifconfig
> vtnet0: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=4c00bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE,TXCSUM_IPV6>
> ether 56:16:e9:80:5e:41
> inet 87.233.191.146 netmask 0xfffffff0 broadcast 87.233.191.159
> inet 87.233.191.156 netmask 0xffffffff broadcast 87.233.191.156
> inet 87.233.191.155 netmask 0xffffffff broadcast 87.233.191.155
> inet 87.233.191.154 netmask 0xffffffff broadcast 87.233.191.154
> media: Ethernet autoselect (10Gbase-T <full-duplex>)
> status: active
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> vtnet1: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=4c07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,TXCSUM_IPV6>
> ether 56:16:2c:64:32:35
> media: Ethernet autoselect (10Gbase-T <full-duplex>)
> status: active
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
> options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
> inet6 ::1 prefixlen 128
> inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
> inet 127.0.0.1 netmask 0xff000000
> groups: lo
> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> bridge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> ether 58:9c:fc:10:ff:82
> inet 10.233.185.1 netmask 0xffffff00 broadcast 10.233.185.255
> id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
> maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
> root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
> member: epair20a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>        ifmaxaddr 0 port 7 priority 128 path cost 2000
> member: epair18a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>        ifmaxaddr 0 port 15 priority 128 path cost 2000
> groups: bridge
> nd6 options=9<PERFORMNUD,IFDISABLED>
> bridge1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> ether 58:9c:fc:10:d9:1a
> id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
> maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
> root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
> member: vtnet0 flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
>        ifmaxaddr 0 port 1 priority 128 path cost 2000
> groups: bridge
> nd6 options=9<PERFORMNUD,IFDISABLED>
> pflog0: flags=141<UP,RUNNING,PROMISC> metric 0 mtu 33160
> groups: pflog
> epair18a: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> description: jail_web01
> options=8<VLAN_MTU>
> ether 02:77:ea:19:c7:0a
> groups: epair
> media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
> status: active
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> epair20a: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> description: jail_haproxy
> options=8<VLAN_MTU>
> ether 02:9b:93:8c:59:0a
> groups: epair
> media: Ethernet 10Gbase-T (10Gbase-T <full-duplex>)
> status: active
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> 
> jail.conf
> 
> # Global settings applied to all jails.
> $domain = "test.nl";
> 
> exec.start = "/bin/sh /etc/rc";
> exec.stop = "/bin/sh /etc/rc.shutdown";
> exec.clean;
> 
> mount.fstab = "/storage/jails/$name.fstab";
> 
> exec.system_user  = "root";
> exec.jail_user    = "root";
> mount.devfs;
> sysvshm="new";
> sysvsem="new";
> allow.raw_sockets;
> allow.set_hostname = 0;
> allow.sysvipc;
> enforce_statfs = "2";
> devfs_ruleset     = "11";
> 
> path = "/storage/jails/${name}";
> host.hostname = "${name}.${domain}";
> 
> 
> # Networking
> vnet;
> vnet.interface    = "vnet0";
> 
>   # Commands to run on host before jail is created
>   exec.prestart  = "ifconfig epair${ip} create up description jail_${name}";
>   exec.prestart  += "ifconfig epair${ip}a up";
>   exec.prestart  += "ifconfig bridge0 addm epair${ip}a up";
>   exec.created   = "ifconfig epair${ip}b name vnet0";
> 
>   # Commands to run in jail after it is created
>   exec.start  += "/bin/sh /etc/rc";
> 
>   # commands to run in jail when jail is stopped
>   exec.stop  = "/bin/sh /etc/rc.shutdown";
> 
>   # Commands to run on host when jail is stopped
>   exec.poststop  = "ifconfig bridge0 deletem epair${ip}a";
>   exec.poststop  += "ifconfig epair${ip}a destroy";
>   persist;
> 
> web01 {
>     $ip = 18;
> }
> 
> haproxy {
>     $ip = 20;
>     mount.fstab = "";
>     path = "/storage/jails/${name}";
> }
> 
> pf.conf
> 
> #######################################################################
> ext_if="vtnet0"
> table <bruteforcers> persist
> table <torlist> persist
> table <ssh-trusted> persist file "/usr/local/etc/pf/ssh-trusted"
> table <custom-block> persist file "/usr/local/etc/pf/custom-block"
> table <jailnetworks> { 10.233.185.0/24, 192.168.10.0/24 }
> 
> icmp_types = "echoreq"
> junk_ports="{ 135,137,138,139,445,68,67,3222,17500 }"
> 
> # Log interface
> set loginterface $ext_if
> 
> # Set limits
> set limit { states 40000, frags 20000, src-nodes 20000 }
> 
> scrub on $ext_if all fragment reassemble no-df random-id
> 
> # ---- Nat jails to the web
> binat on $ext_if from 10.233.185.15/32 to !10.233.185.0/24 -> 87.233.191.156/32 # saltmaste
> binat on $ext_if from 10.233.185.20/32 to !10.233.185.0/24 -> 87.233.191.155/32 # haproxy
> binat on $ext_if from 10.233.185.22/32 to !10.233.185.0/24 -> 87.233.191.154/32 # web-comb
> 
> nat on $ext_if from <jailnetworks> to any -> ($ext_if:0)
> 
> # ---- First rule obligatory "Pass all on loopback"
> pass quick on lo0 all
> pass quick on bridge0 all
> pass quick on bridge1 all
> 
> # ---- Block TOR exit addresses
> block quick proto { tcp, udp } from <torlist> to $ext_if
> 
> # ---- Second rule "Block all in and pass all out"
> block in log all
> pass out all keep state
> 
> # IPv6 pass in/out all IPv6 ICMP traffic
> pass in quick proto icmp6 all
> 
> # Pass all lo0
> set skip on lo0
> 
> ############### FIREWALL ###############################################
> # ---- Block custom ip's and logs
> block quick proto { tcp, udp } from <custom-block> to $ext_if
> 
> # ---- Jail poorten
> pass in quick on { $ext_if } proto tcp from any to 10.233.185.22 port { smtp 80 443 993 995 1956 } keep state
> pass in quick on { $ext_if } proto tcp from any to 10.233.185.20 port { smtp 80 443 993 995 1956 } keep state
> pass in quick on { $ext_if } proto tcp from any to 10.233.185.15 port { 4505 4506 } keep state
> 
> # ---- Allow ICMP
> pass in inet proto icmp all icmp-type $icmp_types keep state
> pass out inet proto icmp all icmp-type $icmp_types keep state
> 
> pass in quick on $ext_if inet proto tcp from any to $ext_if port { 80, 443 } flags S/SA keep state
> pass in quick on $ext_if inet proto tcp from <ssh-trusted> to $ext_if port { 4505 4506 } flags S/SA keep state
> block log quick from <bruteforcers>
> pass quick proto tcp from <ssh-trusted> to $ext_if port ssh flags S/SA keep state
> 
> This is as minimal i can get it.
> 
> Hope this helps.
> regards,
> Johan Hendriks
> 
> 
> Op za 12 mrt. 2022 om 02:10 schreef Kristof Provost <kp@freebsd.org>:
>> On 11 Mar 2022, at 18:55, Michael Gmelin wrote:
>> >> On 12. Mar 2022, at 01:21, Kristof Provost <kp@freebsd.org> wrote:
>> >>
>> >> On 11 Mar 2022, at 17:44, Johan Hendriks wrote:
>> >>>> On 09/03/2022 20:55, Johan Hendriks wrote:
>> >>>> The problem:
>> >>>> I have a FreeBSD 14 machine and a FreeBSD 13-stable machine, both running the same jails just to test the workings.
>> >>>>
>> >>>> The jails that are running are a salt master, a haproxy  jail, 2 webservers, 2 varnish servers, 2 php jails one for php8.0 and one with 8.1. All the jails are connected to bridge0 and all the jails use vnet.
>> >>>>
>> >>>> I believe this worked on an older 14-HEAD machine, but i did not do a lot with it back then, and when i started testing again and after updating the OS i noticed that one of the varnish jails lost it's network connection after running for a few hours. I thought it was just something on HEAD so never really looked at it. But later on when i start using the jails again and testing a test wordpress site i noticed that with a simple load test my haproxy jail within one minute looses it's network connection. I see nothing in the logs, on the host and on the jail.
>> >>>> From the jail i can not ping the other jails or the IP adres of the bridge. I can however ping the jails own IP adres. From the host i can also not ping the haproxy jail IP adres. If i start a tcpdump on the epaira interface from the haproxy jail i do see the packets arrive but not in the jail.
>> >>>>
>> >>>> I used ZFS to send all the jails to a 13-STABLE machine and copied over the jail.conf file as well as the pf.conf file and i saw the same behavior.
>> >>>>
>> >>>> Then i tried to use 13.0-RELEASE-p7 and on that machine i do not see this happening. There i can stress test the machine for 10 minutes without a problem but on 14-HEAD and 13-STABLE within a minute the jail's network connection fails and only a restart of the jail brings it back online to exhibit the same behavior if i start a simple load test which it should handle nicely.
>> >>>>
>> >>>> One of the jail hosts is running under VMWARE and the other is running under Ubuntu with KVM. The 13.0-RELEASE-p7 jail host is running under Ubuntu with KVM
>> >>>>
>> >>>> Thank you for your time.
>> >>>> regards
>> >>>> Johan
>> >>>>
>> >>> I did some bisecting and the latest commit that works on FreeBSD 13-Stable is 009a56b2e
>> >>> Then the commit 2e0bee4c7  if_epair: implement fanout and above is showing the symptoms described above.
>> >>>
>> >> Interestingly I cannot reproduce stalls in simple epair setups.
>> >> It would be useful if you could reduce the setup with the problem into a minimal configuration so we can figure out what other factors are involved.
>> >
>> > If there are clear instructions on how to reproduce, I’m happy to help experimenting (I’m relying heavily on epair at this point).
>> >
>> > @Kristof: Did you try on bare metal or on vms?
>> >
>> Both.
>> 
>> Kristof
>