On Wed, Aug 21, 2019 at 7:30 PM Debraj Manna <subharaj.ma...@gmail.com> wrote:
> I am having a unit file like below running on Ubuntu 16.04 with systemd > version 229. > > [Unit] > Description=Hadoop-Yarn-Resourcemanager Service > [Service] > Type=simple > Environment=JAVA_HOME=/usr/lib/jvm/jdk1.8 > Environment=YARN_USER=yarn > Environment=YARN_IDENT_STRING=yarn > Environment=YARN_PID_DIR=/var/run/hadoop-yarn > Environment=YARN_LOG_DIR=/var/log/hadoop-yarn > Environment=YARN_CONF_DIR=/etc/hadoop/conf > Environment=HADOOP_LIBEXEC_DIR=/usr/lib/hadoop/libexec > IgnoreSIGPIPE=false > ExecStart=/home/ubuntu/build-target/cdh/yarn-rm/hadoop-yarn-resourcemanager-sysd-start.sh > ExecStopPost=-/bin/bash > /home/ubuntu/build-target/cdh/yarn-rm/hadoop-yarn-resourcemanager-sysd-poststop.sh > ExecStopPost=-/bin/sleep 1 > RestartSec=2s > Restart=always > [Install] > WantedBy=multi-user.target > > hadoop-yarn-resourcemanager-sysd-start.sh looks like below > > #!/bin/bash > > echo "Running pre-steps for hadoop-yarn-resourcemanager" > sudo mkdir -p $YARN_LOG_DIR > sudo chown -R yarn:hadoop $YARN_LOG_DIR > sudo mkdir -p $YARN_PID_DIR > sudo chown yarn:yarn $YARN_PID_DIR > echo "Starting hadoop-yarn-resourcemanager" > sudo -u yarn /usr/lib/hadoop-yarn/sbin/yarn-daemon.sh start resourcemanager > sleep 3 > echo "Starting health check for hadoop-yarn-resourcemanager" > /home/ubuntu/build-target/cdh/yarn-rm/hadoop-yarn-resourcemanager-sysd-health.sh > res=$? > > Usually `sudo` resets all environment variables except whitelisted ones. That's not a systemd thing – pid1 *cannot* affect how environment variables are inherited. Don't use sudo in systemd startup scripts. Create the pid_dir using RuntimeDirectory= (or tmpfiles.d), then just start yarn-daemon from ExecStart directly with User=yarn. And probably more importantly, don't start multiple services from a single .service unit – it will never work well... (Chances are, if you do this, you won't even *need* a PIDFile because systemd will be able to track the process directly.) -- Mantas Mikulėnas
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