[Users] Localhost connectivity stops working

[Narcis Garcia]

"Debian OpenVZ 6 machines" means the hardware (host) nodes or VPS?


El 16/01/18 a les 15:37, Baptiste Ashka ha escrit:
> Hi,
> 
> I am encountering a network-related issue with some Debian OpenVZ 6
> (2.6.32-openvz-042stab127.2-amd64) machines that occurs at seemingly
> random and that only happens on OpenVZ nodes: all connect() syscalls
> that try to connect to 127.0.0.1 (IPv4) will timeout. Connecting to ::
> (IPv6) works, any other 127.x.x.x addresses work. Rebooting the hardware
> node is the most consistent workaround we have (but it does not fix the
> issue every time either), stopping a bunch of CTs sometimes also fixes
> the issue, sometimes weird things happen (e.g. suspend a specific CT,
> 127.0.0.1 works again, resume the CT, 127.0.0.1 stops working, suspend
> this CT again, 127.0.0.1 does not work). This does not appear to be a
> socket count limit issue, from what I can tell.
> 
> This happens sporadically but consistently on all our machines. Is
> anyone having this issue/something close to it?
> 
> strace of a connect() syscall using curl:
> socket(PF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
> setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> connect(3, {sa_family=AF_INET, sin_port=htons(8080),
> sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ETIMEDOUT (Connection timed out)
> 
> Thank you
> 
> 
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