timer only running once

[email protected]

[Unit]
Description=Etcd Backup Ruby %i
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=300
EnvironmentFile=/etc/environment
EnvironmentFile=/etc/custom_environment
ExecStartPre=-/usr/bin/docker kill %p-%i
ExecStartPre=-/usr/bin/docker rm %p-%i
ExecStartPre=/usr/bin/docker pull ${REGISTRY_HOST}/company/%p:latest
ExecStart=/usr/bin/bash -l -c ' _ETCDCTL_CA_FILE_DATA="$(etcdctl get /$${CLUSTER_ENV}/services/etcd/cacert)"; .... docker run foo bar
ExecStop=/usr/bin/docker stop %p-%i

[email protected]

[Unit]
Description=Timer unit for Etcd Backup Ruby %i
After=docker.service
Requires=docker.service

[Timer]
OnActiveSec=2min
Unit=%p@%i.service

[Install]
WantedBy=timers.target

[X-Fleet]
MachineOf=%p@%i.service

systemctl list-timers

core@ip-172-16-20-143 ~ $ systemctl list-timers --all
NEXT                         LEFT          LAST                         PASSED  UNIT                          ACTIVATES
Tue 2015-07-21 11:25:05 UTC  8s left       Tue 2015-07-21 11:24:05 UTC  51s ago motdgen.timer                 motdgen.service
Tue 2015-07-21 11:26:19 UTC  1min 22s left n/a                          n/a     [email protected] [email protected]

service runs, and then:

core@ip-172-16-20-143 ~ $ systemctl list-timers --all
NEXT                         LEFT          LAST                         PASSED      UNIT                          ACTIVATES
n/a                          n/a           Tue 2015-07-21 11:26:20 UTC  4min 3s ago [email protected] [email protected]
Tue 2015-07-21 11:31:10 UTC  46s left      Tue 2015-07-21 11:30:10 UTC  13s ago     motdgen.timer                 motdgen.service
Tue 2015-07-21 16:44:24 UTC  5h 14min left Mon 2015-07-20 16:44:24 UTC  18h ago     systemd-tmpfiles-clean.timer  systemd-tmpfiles-clean.service
n/a                          n/a           n/a                          n/a         update-engine-stub.timer      update-engine-stub.service