![Upstart 进程被列为停止/等待](https://linux22.com/image/877905/Upstart%20%E8%BF%9B%E7%A8%8B%E8%A2%AB%E5%88%97%E4%B8%BA%E5%81%9C%E6%AD%A2%2F%E7%AD%89%E5%BE%85.png)
我有这个新贵脚本
当我运行时:sudo start poxa
它启动了该过程,但是当我运行时:initctl list
它显示它是,stop/waiting
但是当我检查ps aux | grep poxa
它时显示该过程。
并且,正如预期的那样,当我尝试停止它时,sudo stop poxa
它返回:stop: unknown instance:
# Upstart Configuration
# put on /etc/init
description "Poxa"
author "Poxa"
start on (filesystem or runlevel [2345])
stop on runlevel [!2345]
#respawn
#respawn limit 10 5
umask 022
console none
pre-start script
test -x /home/ec2-user/poxa/rel/poxa/bin/poxa || { stop; exit 0; }
end script
pre-stop script
echo "[`date -u +%Y-%m-%dT%T.%3NZ`] Stoping..." >> /var/log/poxa.log 2>&1
end script
script
export HOME=/home/ec2-user
echo "[`date -u +%Y-%m-%dT%T.%3NZ`] Starting..." >> /var/log/poxa.log 2>&1
exec /home/ec2-user/poxa/rel/poxa/bin/poxa start >> /var/log/poxa.log 2>&1
end script
ps aux | grep poxa
root 29032 0.0 0.1 13656 1720 ? S 11:42 0:00 /usr/local/lib/erlang/erts-7.0/bin/run_erl -daemon /home/ec2-user/poxa/rel/poxa/tmp/erl_pipes/poxa/ /home/ec2-user/poxa/rel/poxa/log exec "/home/ec2-user/poxa/rel/poxa/bin/poxa" "console"
root 29033 0.3 2.0 318992 21100 pts/1 Ssl+ 11:42 0:00 /usr/local/lib/erlang/erts-7.0/bin/beam -- -root /home/ec2-user/poxa/rel/poxa -progname home/ec2-user/poxa/rel/poxa/releases/0.4.3/poxa.sh -- -home /home/ec2-user -- -boot /home/ec2-user/poxa/rel/poxa/releases/0.4.3/poxa -boot_var ERTS_LIB_DIR /usr/local/lib/erlang/erts-7.0/../lib -config /home/ec2-user/poxa/rel/poxa/running-config/sys.config -pa /home/ec2-user/poxa/rel/poxa/lib/consolidated -name [email protected] -setcookie
poxa -user Elixir.IEx.CLI -extra --no-halt +iex -- console
我做了这个:http://upstart.ubuntu.com/cookbook/#how-to-establish-fork-count得到叉数但它返回44
!
答案1
Upstart守护进程有三种守护进程模式no expect
:expect fork
expect daemon
6.13.5 错误指定预期的影响
正如您在那里看到的,您需要检查进程分叉数。
如果插入expect fork
,则该"exec /home/ec2-user/poxa/rel/poxa/bin/poxa start"
进程需要fork
一次和exit
。此外,它还需要fork
两次和exit
。upstartexpect daemon
将使用trace
最后一个子进程的 pid。
要使用 upstart 脚本正确运行守护进程,您需要检查fork
进程poxa
。
以下是我针对 upstart 和简单守护进程的示例。
新贵脚本/etc/init
# egservice - eg daemon
#
# This is an example
# upstart script.
description "egservice"
start on runlevel [2345]
stop on runlevel [!2345]
#LOOK Following line, So egdaemon needs to fork just once.
expect fork
respawn
exec /sbin/egdaemon
egdaemon.c
为了/sbin/egdaemon
#include <stdio.h>
int main()
{
/* LOOK following line, just once fork and main does not wait child and die,
so new child will be changed to a init's child and also a daemon. */
int pid = fork();
if (pid == 0) {
while (1) {
printf("Example daemon\n");
sleep(1);
}
}
return 0;
}
并且可以使用以下命令将该 C 源文件编译为可执行二进制文件。
$ gcc -o egdaemon egdaemon.c
答案2
您可以检查添加expect fork
(以下umask 022
行)是否有帮助。如果 poxa 二进制文件进入后台,这应该有助于 upstart 跟踪 pid。