Mythtv with systemd problems [SOLVED]

Question

Anyone using mythtv with systemd?  I am using the following to get systemd to start mythbackend but it attempts to start before mysqld is fully ready and thus fails:
$ cat /etc/systemd/system/mythbackend.service
[Unit]
Description=MythTV backend service
After=network.target mysqld.service
[Service]
Type=simple
Environment=MYTHCONFDIR=/etc/conf.d/mythbackend
Environment=HOME=/usr/share/mythtv
User=mythtv
ExecStart=/usr/bin/mythbackend --logpath /var/log/mythtv
[Install]
WantedBy=multi-user.target
Here is the status output... any advice?
# systemctl status mythbackend.service
mythbackend.service - MythTV backend service
Loaded: loaded (/etc/systemd/system/mythbackend.service; enabled)
Active: failed (Result: exit-code) since Thu, 10 May 2012 11:59:57 -0400; 2min 40s ago
Process: 415 ExecStart=/usr/bin/mythbackend --logpath /var/log/mythtv/mythbackend.log (code=exited, status=130)
CGroup: name=systemd:/system/mythbackend.service
May 10 11:59:54 mars mythbackend[415]: 2012-05-10 11:59:54.273466 E Driver error was [1/2002]:
May 10 11:59:54 mars mythbackend[415]: QMYSQL: Unable to connect
May 10 11:59:54 mars mythbackend[415]: Database error was:
May 10 11:59:54 mars mythbackend[415]: Can't connect to local MySQL server through socket '/var/ru... (2)
May 10 11:59:56 mars mythbackend[415]: No UPnP backends found
May 10 11:59:56 mars mythbackend[415]: Would you like to configure the database connection now? [no]
May 10 11:59:56 mars mythbackend[415]: [console is not interactive, using default 'no']
May 10 11:59:56 mars mythbackend[415]: 2012-05-10 11:59:56.526065 I UPnPautoconf() - No UPnP back...ound
May 10 11:59:56 mars mythbackend[415]: 2012-05-10 11:59:56.526080 A No UPnP backends found
May 10 11:59:56 mars mythbackend[415]: 2012-05-10 11:59:56.526190 C Failed to init MythContext.
Last edited by graysky (2012-05-11 20:17:34)

Answer 1

Cool, 65kid.  Back on topic: http://rpm.pbone.net/index.php3/stat/4/ … 4.rpm.html
$ cat ./usr/libexec/mysqld-wait-ready
#!/bin/sh
# This script waits for mysqld to be ready to accept connections
# (which can be many seconds or even minutes after launch, if there's
# a lot of crash-recovery work to do).
# Running this as ExecStartPost is useful so that services declared as
# "After mysqld" won't be started until the database is really ready.
# Service file passes us the daemon's PID
daemon_pid="$1"
# extract value of a MySQL option from config files
# Usage: get_mysql_option SECTION VARNAME DEFAULT
# result is returned in $result
# We use my_print_defaults which prints all options from multiple files,
# with the more specific ones later; hence take the last match.
get_mysql_option(){
result=`/usr/bin/my_print_defaults "$1" | sed -n "s/^--$2=//p" | tail -n 1`
if [ -z "$result" ]; then
# not found, use default
result="$3"
fi
# Defaults here had better match what mysqld_safe will default to
get_mysql_option mysqld datadir "/var/lib/mysql"
datadir="$result"
get_mysql_option mysqld socket "$datadir/mysql.sock"
socketfile="$result"
# Wait for the server to come up or for the mysqld process to disappear
ret=0
while /bin/true; do
RESPONSE=`/usr/bin/mysqladmin --socket="$socketfile" --user=UNKNOWN_MYSQL_USER ping 2>&1`
mret=$?
if [ $mret -eq 0 ]; then
break
fi
# exit codes 1, 11 (EXIT_CANNOT_CONNECT_TO_SERVICE) are expected,
# anything else suggests a configuration error
if [ $mret -ne 1 -a $mret -ne 11 ]; then
ret=1
break
fi
# "Access denied" also means the server is alive
echo "$RESPONSE" | grep -q "Access denied for user" && break
# Check process still exists
if ! /bin/kill -0 $daemon_pid 2>/dev/null; then
ret=1
break
fi
sleep 1
done
WTF: /usr/bin/my_print_defaults
Here is the Arch rc.d script... how to adapt this for systemd?
stat_busy "Starting MySQL Server"
[ ! -d /var/run/mysqld ] && install -d -g mysql -o mysql /var/run/mysqld &>/dev/null
if [ -z "$(getPID)" ]; then
/usr/bin/mysqld_safe --user=mysql &>/dev/null &
if [ $? -gt 0 ]; then
stat_fail
exit 1
else
timeo=30
while [ $timeo -gt 0 ]; do
response=`/usr/bin/mysqladmin -uUNKNOWN_USER ping 2>&1` && break
echo "$response" | grep -q "mysqld is alive" && break
sleep 1
let timeo=${timeo}-1
done
if [ $timeo -eq 0 ]; then
stat_fail
exit 1
else
echo $(getPID) > /var/run/mysqld/mysqld.pid
add_daemon mysqld
stat_done
fi
fi
else
stat_fail
exit 1
fi
Last edited by graysky (2012-05-10 19:06:04)