[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [OSSTEST PATCH 1/7] Debian installs: Nobble /etc/network/if-up.d/openssh-server
(See the comment in the new file for the explanation.) This change affects all our Debian installs (both hosts and guests) which are done with preseeding, because preseed_base() arranges to install overlay/. Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> --- overlay/etc/network/if-up.d/openssh-server | 32 ++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100755 overlay/etc/network/if-up.d/openssh-server diff --git a/overlay/etc/network/if-up.d/openssh-server b/overlay/etc/network/if-up.d/openssh-server new file mode 100755 index 0000000..9fe2faf --- /dev/null +++ b/overlay/etc/network/if-up.d/openssh-server @@ -0,0 +1,32 @@ +#!/bin/sh +exit 0 + +# In a default Debian install, this script reloads (or, in some +# versions of Debian, restarts) sshd as new network interfaces come +# up. This is in case you have specific listen addresses specified in +# the config. +# +# But the default config listens on 0.0.0.0 and ::. So sshd is active +# as soon as an interface is up, and does not need to be restarted or +# reloaded. +# +# This restarting or reloading is harmful because it causes ssh to +# stop listening briefly. We can see the following race: +# +# target sshd target dhcp client osstest controller +# +# starts starts +# binds to ANY obtains lease +# configures eth0 +# connects to :22 with nc +# accepts conn nc succeeds +# decides target sshd is up +# runs ifup hook +# ifup hook reloads +# +# gets SIGHUP +# closes listen socket +# rereads config runs ssh root@target +# ssh gets ECONNREFUSED +# opens new listen socket +# declares test fail -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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