Description of problem:
Trying to add Type=notify to system containers unit file in order to catch errors from runc start.

# cat /etc/systemd/system/etcd.service 
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
ExecStart=/bin/runc start 'etcd'
ExecStop=/bin/runc kill 'etcd'
Restart=on-failure
WorkingDirectory=/sysroot/ostree/deploy/rhel-atomic-host/var/lib/containers/atomic/etcd.0
RuntimeDirectory=etcd

[Install]
WantedBy=multi-user.target

However, it ends up with "systemctl start etcd" hang. Steps to reproduce below,

# atomic uninstall etcd
# runc delete etcd
# atomic install --system --name=etcd brew-pulp-docker01.web.prod.ext.phx2.redhat.com:8888/rhel7/etcd:latest
# systemctl start etcd

Only thing seems to get it working is to append -d to runc start in the unit file, but that causes both runc list and atomic containers list not correctly list the running containers.

# rpm -q runc atomic
runc-0.1.1-6.el7.x86_64
atomic-1.12.5-2.el7.x86_64

Developer confirmed that etcd is a sd-notify process, and the original etcd rpm uses Type=notify as well.

# cat /usr/lib/systemd/system/etcd.service 
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
User=etcd
# set GOMAXPROCS to number of processors
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd --name=\"${ETCD_NAME}\" --data-dir=\"${ETCD_DATA_DIR}\" --listen-client-urls=\"${ETCD_LISTEN_CLIENT_URLS}\""
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target