I use the class ServerApplication of POCO library, and start up a program using "--daemon" option. I find that I could generate core dump file for a console running application, but could not do that for this daemon application.
take a look at Net/samples/TimeServer/src/TimeServer.cpp
It can generate core file
[root#slayer src]# pwd
/root/cppstuff/poco-1.4.5-all/Net/samples/TimeServer/src
[root#slayer src]# g++ TimeServer.cpp -lPocoUtil -lPocoNet -g -o tsev
[root#slayer src]# ls
tcln.py TimeServer.cpp tsev tsev.properties
[root#slayer src]# ulimit -c unlimited
[root#slayer src]# ./tsev --daemon
[root#slayer src]# ps aux | grep tsev | grep -v grep
root 13498 0.0 0.5 60680 2160 ? Ssl 16:18 0:00 ./tsev --daemon
[root#slayer src]# gcore 13498
[Thread debugging using libthread_db enabled]
[New Thread 0x2ad7c2c36940 (LWP 13501)]
[New Thread 0x2ad7c2235940 (LWP 13500)]
[New Thread 0x2ad7c1834940 (LWP 13499)]
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff935fd000
0x000000346a230898 in do_sigwait () from /lib64/libc.so.6
Saved corefile core.13498
[root#slayer src]# ls
core.13498 tcln.py TimeServer.cpp tsev tsev.properties
Related
I want to know the method the way to get environment variable in HPUX from pid
by ps command, file, or programming.
it is possible to get variable
# /proc/$pid/environ in environ or ps e -ww -p $pid in linux
# ps ewww pid in aix
# pargs in solaris
HP-UX : use gdb to track but there is no gdb on a server(HPUX) and it's impossible to install it.
let me know that.
If you can install software onto this host, the latest HP-UX Linker, Libraries and Tools patch should give you the pargs(1) command:
[ hp-ux_ia64 sw ] $ /usr/ccs/bin/pargs -v
HP pstack/pldd/pargs version B.12.67 for HP Itanium(R) Systems.
[ hp-ux_ia64 sw ] $ /usr/ccs/bin/pargs -h
usage: pargs [-h] [-v] {-a pid | -e pid}
Given the pid of a running process, pargs prints process arguments and all
environment variables and its values.
pargs works by attaching to the process to read its memory.
[ hp-ux_ia64 sw ] $ ps -fu ranga
UID PID PPID C STIME TTY TIME COMMAND
ranga 9949 9923 0 Mar 17 pts/3 0:00 /usr/bin/sh /home/ranga/bin/tmux
ranga 16795 10007 0 10:40:06 pts/7 0:00 ssh hp-ux_ia64
ranga 9952 9949 0 Mar 17 pts/3 0:00 tmux
ranga 16538 16376 1 21:35:16 pts/4 0:00 ps -fu ranga
ranga 9918 9916 0 Mar 17 ? 0:04 sshd: ranga#pts/3
ranga 9954 1 2 Mar 17 ? 1:15 tmux
[ hp-ux_ia64 sw ] $ PHSS_44731/C-MIN/usr/ccs/bin/pargs -e 9949
SOCKS_CONF=/home/ranga/etc/socks.conf
MAIL=/var/mail/ranga
PATH=/usr/bin:/usr/ccs/bin:/usr/contrib/bin:/opt/langtools/bin:/usr/local/bin
PWD=/home/ranga
EDITOR=vim
TZ=IST-5:30
ERASE=^H
PS1=[ \h \W ] \$
SHLVL=1
SHELL=/usr/bin/bash
SFTP_PERMIT_CHMOD=1
HOME=/home/ranga
TERMINFO=/home/ranga/lib/terminfo
LOGNAME=ranga
SSH_CONNECTION=1.4.5.1 44584 1.2.2.2 22
SSH_CLIENT=1.1.0.6 44584 22
SHLIB_PATH=/home/ranga/local/lib
SFTP_UMASK=
_=/home/ranga/bin/tmux
USER=ranga
TERM=rxvt-256color
SOCKS5_SERVER=socks-server.ranga.com
LINES=70
Even if you can't install the patch, the pargs executable can be extracted from it and used.
If you can copy files out of this host, you could
use gcore(1) to generate a core file of the process
copy this core file along with the executable and the appropriate version of
libc (32-bit or 64-bit, use pldd(1) to confirm) to an environment
where gdb is available
use gdb to hack into the __envp string table
[ hp-ux-ia64 ~ ] $ ps -f
UID PID PPID C STIME TTY TIME COMMAND
ranga 5779 4411 0 13:12:47 pts/0 0:00 ps -f
ranga 4411 4403 0 12:45:42 pts/0 0:00 -bash
[ hp-ux-ia64 ~ ] $ pldd 4411
4411: /usr/bin/bash
/usr/bin/bash
/usr/lib/hpux32/dld.so
/usr/local/lib/hpux32/libtermcap.so
/usr/local/lib/hpux32/libintl.so
/usr/local/lib/hpux32/libiconv.so
/usr/lib/hpux32/libdl.so.1
/usr/lib/hpux32/libc.so.1
[ hp-ux-ia64 ~ ] $ gcore 4411
[ hp-ux-ia64 ~ ] $ gdb -q /usr/bin/bash core.4411
warning: Load module /usr/bin/bash has been stripped.
Debugging information is not available.
(no debugging symbols found)...Core was generated by `bash'.
(no debugging symbols found)...
warning: Load module /usr/local/lib/hpux32/libtermcap.so has been stripped.
Debugging information is not available.
(no debugging symbols found)...
#0 0x60000000c05660f0:0 in _waitpid_sys+0x30 () from /usr/lib/hpux32/libc.so.1
(gdb) x/s *(char**)__envp
0x200000007ffffeae: "USER=ranga"
(gdb)
:
0x200000007fffff45: "SSH_CLIENT=3.3.3.3 50072 22"
:
0x200000007fffffe4: "SFTP_PERMIT_CHOWN=1"
(gdb)
0x200000007ffffff8: ""
I have an issue with celery deployment - when I restart it old subprocesses don't stop and continue to process some of jobs. I use supervisord to run celery. Here is my config:
$ cat /etc/supervisor/conf.d/celery.conf
[program:celery]
; Full path to use virtualenv, honcho to load .env
command=/home/ubuntu/venv/bin/honcho run celery -A stargeo worker -l info --no-color
directory=/home/ubuntu/app
environment=PATH="/home/ubuntu/venv/bin:%(ENV_PATH)s"
user=ubuntu
numprocs=1
stdout_logfile=/home/ubuntu/logs/celery.log
stderr_logfile=/home/ubuntu/logs/celery.err
autostart=true
autorestart=true
startsecs=10
; Need to wait for currently executing tasks to finish at shutdown.
; Increase this if you have very long running tasks.
stopwaitsecs = 600
; When resorting to send SIGKILL to the program to terminate it
; send SIGKILL to its whole process group instead,
; taking care of its children as well.
killasgroup=true
; if rabbitmq is supervised, set its priority higher
; so it starts first
priority=998
Here is how celery processes look:
$ ps axwu | grep celery
ubuntu 983 0.0 0.1 47692 10064 ? S 11:47 0:00 /home/ubuntu/venv/bin/python /home/ubuntu/venv/bin/honcho run celery -A stargeo worker -l info --no-color
ubuntu 984 0.0 0.0 4440 652 ? S 11:47 0:00 /bin/sh -c celery -A stargeo worker -l info --no-color
ubuntu 985 0.0 0.5 168720 41356 ? S 11:47 0:01 /home/ubuntu/venv/bin/python /home/ubuntu/venv/bin/celery -A stargeo worker -l info --no-color
ubuntu 990 0.0 0.4 167936 36648 ? S 11:47 0:00 /home/ubuntu/venv/bin/python /home/ubuntu/venv/bin/celery -A stargeo worker -l info --no-color
ubuntu 991 0.0 0.4 167936 36648 ? S 11:47 0:00 /home/ubuntu/venv/bin/python /home/ubuntu/venv/bin/celery -A stargeo worker -l info --no-color
When I run sudo supervisorctl restart celery it only stops first process python ... honcho one and all the other ones continue. And if I try to kill them they continue (kill -9 works).
This appeared to be a bug with honcho. I ended up with workaround of starting this script from supervisor:
#!/bin/bash
source /home/ubuntu/venv/bin/activate
exec env $(cat .env | grep -v ^# | xargs) \
celery -A stargeo worker -l info --no-color
I'm trying to daemonize a rake task by running the following command (on Ubuntu 12.04)
start-stop-daemon -S --pidfile /home/dep/apps/fid/current/tmp/pids/que.pid
-u dep -d /home/dep/apps/fid/current -b -m
-a "bundle exec rake que:work RAILS_ENV=staging > /home/dep/apps/fid/current/log/que.log 2>&1"
-v
The console says
Starting bundle exec rake que:work RAILS_ENV=staging > /home/dep/apps/fid/current/log/que.log 2>&1...
Detaching to start bundle exec rake que:work RAILS_ENV=staging > /home/dep/apps/fid/current/log/que.log 2>&1...done.
but nothing happen.
the pid file is empty and no log file created.
Am I missing anything here?
Thanks.
Try to get more about the environments (and their differences) when running bundle from your normal environment and running it from start-stop-daemon.
e.g. print all env variables in both cases and adjust accordingly.
I am trying to execute pg_dump on PostgreSQL 9.0.4 server running on Debian and I am getting the error below:
./pg_dump: error while loading shared libraries: libpq.so.5: cannot open shared object file: No such file or directory
libpq.so.5 is a link to libpq.so.5.3 as shown below
lrwxrwxrwx 1 root root 12 Jun 27 16:24 libpq.so.5 -> libpq.so.5.3
-rwxr-xr-x 1 root root 180749 Jun 21 02:43 libpq.so.5.3
What is it that I am doing wrong?
Try this:
1: Know the path of libpq.so.5
find / -name libpq.so.5
Output example:
/usr/pgsql-9.4/lib/libpq.so.5
If found nothing, check if you have already installed the suitable postgresql-libs for your postgresql version and your OS platform
2: Symbolic link that library in a "well known" library path like /usr/lib:
ln -s /usr/pgsql-9.4/lib/libpq.so.5 /usr/lib/libpq.so.5
Attention:
If your platform is 64 bit, you MUST also symbolic link to 64 bit libraries path:
ln -s /usr/pgsql-9.4/lib/libpq.so.5 /usr/lib64/libpq.so.5
3: Be happy !
In which directory are these libpq files? You can try setting environment variable LD_LIBRARY_PATH to point to this directory or make sure it's in standard place.
Also, why isn't the libpq.so.5 link shown in the "as shown below" section? Maybe you should just run ldconfig?
Ubuntu 21.10+
Since this is the top search result for the error. I'll add an updated answer. I received the error when trying to start a django server.
I hadn't installed the postgres stuff.
Try:
sudo apt install libpq-dev
See:
https://packages.ubuntu.com/impish/libpq-dev
I was getting the same error message on Postgres 9.5 on RHEL 6.5 which lead me to this post. But a find for the file libpq.so.5 returned nothing, which made things more confusing.
In the end the following symbolic links made it run
ln -s /opt/rh/rh-postgresql95/root/usr/lib64/libpq.so.rh-postgresql95-5 /usr/lib64/libpq.so.rh-postgresql95-5
ln -s /opt/rh/rh-postgresql95/root/usr/lib64/libpq.so.rh-postgresql95-5 /usr/lib/libpq.so.rh-postgresql95-5
These paths are for RHEL, use find / -name libpq.so to location your installation and add it to the same destination folders /usr/lib/ and /usr/lib64/ using the orginal file name.
The root cause appears that the installation did not place this file into a shared location.
This error probably occurs because of $LD_LIBRARY_PATH environment variable is not set.
When you install your application from source code using prefix (./configure --prefix=/some/path), you have to inform where your lib/ path is. I just found a solution for this, and I added this variable to postgres user init bash script:
printf 'export PATH=$PATH:/opt/apl/pgsql/bin\nexport LD_LIBRARY_PATH=/opt/apl/pgsql/lib:$LD_LIBRARY_PATH\n' > /etc/profile.d/postgres.sh
redhat 7 is missing few steps after installing yum install pgadmin4:
sudo ln -s /usr/lib64/pgdg-libpq5/lib/libpq.so /usr/lib64/libpq.so.5
sudo ln -s /usr/lib64/pgdg-libpq5/lib/libpq.so /usr/lib/libpq.so.5
sudo chown -R apache:apache /var/lib/pgadmin4/
then you can run
sudo python3 /usr/lib/python3.6/site-packages/pgadmin4-web/setup.py
and if all successful:
systemctl start httpd
systemctl status httpd
apachectl configtest
and make sure the httpd starts ok
I had exactly the same problem with the pg 9.6 install. I fixed it like this. Rather irritating that the installer doesn't factor this in.
***********post yum install & running initdb *********
Success. You can now start the database server using:
/opt/rh/rh-postgresql96/root/usr/bin/pg_ctl -D /var/opt/rh/rh-postgresql96/lib/pgsql/data -l logfile start
-bash-4.2$ /opt/rh/rh-postgresql96/root/usr/bin/pg_ctl -D /var/opt/rh/rh-postgresql96/lib/pgsql/data -l logfile start
/opt/rh/rh-postgresql96/root/usr/bin/pg_ctl: **error while loading shared libraries: libpq.so.rh-postgresql96-5: cannot open shared object file: No such file or directory**
-bash-4.2$ id
uid=26(postgres) gid=26(postgres) groups=26(postgres) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
**************
-bash-4.2$ cat LibFix
ln -s /opt/rh/rh-postgresql96/root/usr/lib64/libpq.so.rh-postgresql96-5 /usr/lib64/libpq.so.rh-postgresql96-5
ln -s /opt/rh/rh-postgresql96/root/usr/lib64/libpq.so.rh-postgresql96-5 /usr/lib/libpq.so.rh-postgresql96-5
**************
[root#****lab ~]# ln -s /opt/rh/rh-postgresql96/root/usr/lib64/libpq.so.rh-postgresql96-5 /usr/lib64/libpq.so.rh-postgresql96-5
[root#****lab ~]# ln -s /opt/rh/rh-postgresql96/root/usr/lib64/libpq.so.rh-postgresql96-5 /usr/lib/libpq.so.rh-postgresql96-5
[root#****lab ~]# su - postgres
Last login: Thu Apr 5 08:57:21 CEST 2018 on pts/0
-bash-4.2$ /opt/rh/rh-postgresql96/root/usr/bin/pg_ctl -D /var/opt/rh/rh-postgresql96/lib/pgsql/data -l logfile start
server starting
-bash-4.2$ ps -ef | grep postgres
root 12778 7883 0 09:07 pts/0 00:00:00 su - postgres
postgres 12779 12778 0 09:07 pts/0 00:00:00 -bash
postgres 12802 1 0 09:08 pts/0 00:00:00 /opt/rh/rh-postgresql96/root/usr/bin/postgres -D /var/opt/rh/rh-postgresql96/lib/pgsql/data
postgres 12803 12802 0 09:08 ? 00:00:00 postgres: logger process
postgres 12805 12802 0 09:08 ? 00:00:00 postgres: checkpointer process
postgres 12806 12802 0 09:08 ? 00:00:00 postgres: writer process
postgres 12807 12802 0 09:08 ? 00:00:00 postgres: wal writer process
postgres 12808 12802 0 09:08 ? 00:00:00 postgres: autovacuum launcher process
postgres 12809 12802 0 09:08 ? 00:00:00 postgres: stats collector process
postgres 12810 12779 0 09:08 pts/0 00:00:00 ps -ef
-bash-4.2$ id
uid=26(postgres) gid=26(postgres) groups=26(postgres) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
-bash-4.2$ psql
psql (9.6.5)
postgres=# \conninfo
You are connected to database "postgres" as user "postgres" via socket in "/var/run/postgresql" at port "5432".
I am working on a PostgreSQL extension in C that segfaults, so I want to look at the core dump file on my OS X Lion box. However, there are no core files in /cores or anywhere else that I can find. It appears that they are enabled in the system but are limited to a size of 0:
> sysctl kern.coredump
kern.coredump: 1
> ulimit -c
0
I tried setting ulimit -c unlimited in the shell session I'm using to start and stop PostgreSQL, and it seems to stick:
> ulimit -c
unlimited
And yet no matter what I do, no core files. I am starting PostgreSQL with pg_ctl -c, where the -c tells PostgreSQL to generate core dumps. But the system has nothing. How can I get Lion to dump core files?
The /cores/ directory is not necessarily there in Lion , and if it's not there, you won't get cores. You should be able to set the ulimit (as you have), run a program like cat(1), quit with a SIGQUIT (control-backslash) and get a coredump:
lion:~ user$ ulimit -c unlimited
lion:~ user$ cat
^\
^\
Quit: 3 (core dumped)
lion:~ user$ ls -l /cores/
total 716584
-r-------- 1 user user 366891008 Jun 21 23:35 core.1263
lion:~ user$
Technical Note TN2124 http://developer.apple.com/library/mac/#technotes/tn2124/ as suggested by Yuji in https://stackoverflow.com/a/3783403/225077 is helpful.