ubuntu 16 上自定義建構 openssh-hpn-sshd 的無限啟動狀態

我已經編譯了 hpn 版本的 openssh(OpenSSH_7.2p2-hpn14v11)，sshd 本身工作得很好。問題是每 2-3 分鐘 systemd 會重新啟動 sshd，因為它沒有正確啟動該服務。當我用相同版本的 Ubuntu 軟體包替換它時，它可以正常工作。我什至用全新安裝在 VM 上進行了測試——同樣的事情。我究竟做錯了什麼？

 ● ssh.service - OpenBSD Secure Shell server 
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled) 
Active: activating (start) since Wed 2016-09-28 20:18:49 EDT; 42s ago 
Main PID: 24279 (sshd) 
Tasks: 9 
Memory: 6.8M 
CPU: 164ms 
CGroup: /system.slice/ssh.service ├─20041 sshd: 
root@pts/0 ├─20047 
-bash ├─24279 
/usr/sbin/sshd -D ├─24628 
└─24629 pager
Sep 28 20:18:49 hostname systemd[1]: Starting OpenBSD Secure Shell server... Sep 28 20:18:49 hostname sshd[24279]: Server listening on 0.0.0.0 port 22

cat /lib/systemd/system/ssh.service
[Unit]
Description=OpenBSD Secure Shell server
After=network.target auditd.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Service]
EnvironmentFile=-/etc/default/ssh
ExecStart=/usr/sbin/sshd -D $SSHD_OPTS
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartPreventExitStatus=255
Type=notify

[Install]
WantedBy=multi-user.target
Alias=sshd.service


Logs:
   Sep 29 02:22:03 xxx sshd[15007]: Server listening on 0.0.0.0 port 22.
   Sep 29 02:22:03 xxx sshd[15007]: Server listening on :: port 22.
   Sep 29 02:23:33 xxx systemd[1]: ssh.service: Start operation timed out. Terminating.
   Sep 29 02:23:33 xxx systemd[1]: Failed to start OpenBSD Secure Shell server.
   Sep 29 02:23:33 xxx systemd[1]: ssh.service: Unit entered failed state.
   Sep 29 02:23:33 xxx systemd[1]: ssh.service: Failed with result 'timeout'.
   Sep 29 02:23:33 xxx systemd[1]: ssh.service: Service hold-off time over, scheduling restart.
   Sep 29 02:23:33 xxx systemd[1]: Stopped OpenBSD Secure Shell server.
   Sep 29 02:23:33 xxx systemd[1]: Starting OpenBSD Secure Shell server...
   Sep 29 02:23:33 xxx sshd[15775]: Server listening on 0.0.0.0 port 22.
   Sep 29 02:23:33 xxx sshd[15775]: Server listening on :: port 22.

Ubuntu 放棄使用 systemd 方式讓 systemd 知道它何時啟動。從選項Type=notify中可以明顯看出，沒有 Systemd 更新檔就無法使用 OpenSSH。有兩種可能的解決方案：

1. 將行更改Type=notify為Type=forking並添加新行，PIDFile=/var/run/sshd.pid並ExecStart應更改為/usr/sbin/sshd $SSHD_OPTS：

Type=forking
PIDFile=/var/run/sshd.pid
ExecStart=/usr/sbin/sshd $SSHD_OPTS

2. 使用來自 Debian/Ubuntu的更新檔建構您的 OpenSSH ：

---

From fe97848e044743f0bac019a491ddf0138f84e14a Mon Sep 17 00:00:00 2001
From: Michael Biebl <biebl@debian.org>
Date: Mon, 21 Dec 2015 16:08:47 +0000
Subject: Add systemd readiness notification support

Bug-Debian: https://bugs.debian.org/778913
Forwarded: no
Last-Update: 2016-01-04

Patch-Name: systemd-readiness.patch
---
configure.ac | 24 ++++++++++++++++++++++++
sshd.c       |  9 +++++++++
2 files changed, 33 insertions(+)

diff --git a/configure.ac b/configure.ac
index f822fb3..6cafb15 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4319,6 +4319,29 @@ AC_ARG_WITH([kerberos5],
AC_SUBST([GSSLIBS])
AC_SUBST([K5LIBS])

+# Check whether user wants systemd support
+SYSTEMD_MSG="no"
+AC_ARG_WITH(systemd,
+   [  --with-systemd          Enable systemd support],
+   [ if test "x$withval" != "xno" ; then
+       AC_PATH_TOOL([PKGCONFIG], [pkg-config], [no])
+       if test "$PKGCONFIG" != "no"; then
+           AC_MSG_CHECKING([for libsystemd])
+           if $PKGCONFIG --exists libsystemd; then
+               SYSTEMD_CFLAGS=`$PKGCONFIG --cflags libsystemd`
+               SYSTEMD_LIBS=`$PKGCONFIG --libs libsystemd`
+               CPPFLAGS="$CPPFLAGS $SYSTEMD_CFLAGS"
+               SSHDLIBS="$SSHDLIBS $SYSTEMD_LIBS"
+               AC_MSG_RESULT([yes])
+               AC_DEFINE(HAVE_SYSTEMD, 1, [Define if you want systemd support.])
+               SYSTEMD_MSG="yes"
+           else
+               AC_MSG_RESULT([no])
+           fi
+       fi
+   fi ]
+)
+
# Looking for programs, paths and files

PRIVSEP_PATH=/var/empty
@@ -5121,6 +5144,7 @@ echo "                   libedit support: $LIBEDIT_MSG"
echo "  Solaris process contract support: $SPC_MSG"
echo "           Solaris project support: $SP_MSG"
echo "         Solaris privilege support: $SPP_MSG"
+echo "                   systemd support: $SYSTEMD_MSG"
echo "       IP address in \$DISPLAY hack: $DISPLAY_HACK_MSG"
echo "           Translate v4 in v6 hack: $IPV4_IN6_HACK_MSG"
echo "                  BSD Auth support: $BSD_AUTH_MSG"
diff --git a/sshd.c b/sshd.c
index 837409b..868df9e 100644
--- a/sshd.c
+++ b/sshd.c
@@ -85,6 +85,10 @@
#include <prot.h>
#endif

+#ifdef HAVE_SYSTEMD
+#include <systemd/sd-daemon.h>
+#endif
+
#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
@@ -2117,6 +2121,11 @@ main(int ac, char **av)
           unsetenv("SSH_SIGSTOP");
       }

+#ifdef HAVE_SYSTEMD
+       /* Signal systemd that we are ready to accept connections */
+       sd_notify(0, "READY=1");
+#endif
+
       /* Accept a connection and return in a forked child */
       server_accept_loop(&sock_in, &sock_out,
           &newsock, config_s);

引用自：https://unix.stackexchange.com/questions/313080