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A scalable overlay networking tool with a focus on performance, simplicity and security

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🐛 BUG: Unable to reconnect after server crash

Cyberes opened this issue · comments

commented

What version of nebula are you using? (nebula -version)

1.8.2

What operating system are you using?

Linux

Describe the Bug

One of my servers has been unstable and will sometimes become unresponsive, requiring a hard reset (this is host A, 172.0.3.109). When it comes back up, it's unable to establish a connection to my node that is a nginx reverse proxy (this is host B, 172.0.2.120). If I manually restart the Nebula service on host A, it fixes the issue and host A can connect to host B.

Logs from affected hosts

Lighthouse 
Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:32 cloud-proxy nebula[689]: time="2024-04-22T12:13:32-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:32 cloud-proxy nebula[689]: time="2024-04-22T12:13:32-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:32 cloud-proxy nebula[689]: time="2024-04-22T12:13:32-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:32 cloud-proxy nebula[689]: time="2024-04-22T12:13:32-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:33 cloud-proxy nebula[689]: time="2024-04-22T12:13:33-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:33 cloud-proxy nebula[689]: time="2024-04-22T12:13:33-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:34 cloud-proxy nebula[689]: time="2024-04-22T12:13:34-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Apr 22 12:13:34 cloud-proxy nebula[689]: time="2024-04-22T12:13:34-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
Host A 
Apr 22 12:12:25 host-a nebula[811]: time="2024-04-22T12:12:25-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:26 host-a nebula[811]: time="2024-04-22T12:12:26-00:00" level=info msg="Tunnel status" certName=host-b localIndex=804429705 remoteIndex=3094684430 tunnelCheck="map[method:active state:dead]" v>
Apr 22 12:12:26 host-a nebula[811]: time="2024-04-22T12:12:26-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:26 host-a nebula[811]: time="2024-04-22T12:12:26-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:26 host-a nebula[811]: time="2024-04-22T12:12:26-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:26 host-a nebula[811]: time="2024-04-22T12:12:26-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:27 host-a nebula[811]: time="2024-04-22T12:12:27-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:27 host-a nebula[811]: time="2024-04-22T12:12:27-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:27 host-a nebula[811]: time="2024-04-22T12:12:27-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:27 host-a nebula[811]: time="2024-04-22T12:12:27-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:28 host-a nebula[811]: time="2024-04-22T12:12:28-00:00" level=info msg="sendNoMetrics failed to find HostInfo" certName=host-b error="unable to find host with relay" localIndex=2480024129 rela>
Apr 22 12:12:28 host-a nebula[811]: time="2024-04-22T12:12:28-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:28 host-a nebula[811]: time="2024-04-22T12:12:28-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:28 host-a nebula[811]: time="2024-04-22T12:12:28-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:28 host-a nebula[811]: time="2024-04-22T12:12:28-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Taking new handshake" certName=host-b localIndex=2480024129 remoteIndex=108412485 vpnIp=172.0.2.120
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message sent" certName=host-b fingerprint=...>
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="sendNoMetrics failed to find HostInfo" certName=host-b error="unable to find host with relay" localIndex=817659693 relay>
Apr 22 12:12:31 host-a nebula[811]: time="2024-04-22T12:12:31-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:23 host-a nebula[811]: time="2024-04-22T12:10:23-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:23 host-a nebula[811]: time="2024-04-22T12:10:23-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:23 host-a nebula[811]: time="2024-04-22T12:10:23-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:24 host-a nebula[811]: time="2024-04-22T12:10:24-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Tunnel status" certName=host-b localIndex=1362300847 remoteIndex=2069131475 tunnelCheck="map[method:active state:dead]" >
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:25 host-a nebula[811]: time="2024-04-22T12:10:25-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:26 host-a nebula[811]: time="2024-04-22T12:10:26-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:26 host-a nebula[811]: time="2024-04-22T12:10:26-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:26 host-a nebula[811]: time="2024-04-22T12:10:26-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:26 host-a nebula[811]: time="2024-04-22T12:10:26-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:27 host-a nebula[811]: time="2024-04-22T12:10:27-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:27 host-a nebula[811]: time="2024-04-22T12:10:27-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:27 host-a nebula[811]: time="2024-04-22T12:10:27-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:27 host-a nebula[811]: time="2024-04-22T12:10:27-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:28 host-a nebula[811]: time="2024-04-22T12:10:28-00:00" level=info msg="sendNoMetrics failed to find HostInfo" certName=host-b error="unable to find host with relay" localIndex=2903481744 rela>
Apr 22 12:10:28 host-a nebula[811]: time="2024-04-22T12:10:28-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:28 host-a nebula[811]: time="2024-04-22T12:10:28-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:28 host-a nebula[811]: time="2024-04-22T12:10:28-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:28 host-a nebula[811]: time="2024-04-22T12:10:28-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Taking new handshake" certName=host-b localIndex=2903481744 remoteIndex=3824716788 vpnIp=172.0.2.120
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message sent" certName=host-b fingerprint=...>
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message received" certName=host-b fingerprint=...>
Apr 22 12:10:30 host-a nebula[811]: time="2024-04-22T12:10:30-00:00" level=info msg="Handshake message sent" cached=true handshake="map[stage:2 style:ix_psk0]" relay=172.0.0.2 vpnIp=172.0.2.120

This pattern repeats.

Host B 
Apr 22 12:06:25 host-b nebula[111]: time="2024-04-22T12:06:25-00:00" level=info msg="Attempt to relay through hosts" localIndex=1813799298 relays="[172.0.0.2 172.0.0.3 172.0.0.2 172.0.0.3]" remoteIndex=0 vpnIp=1>
Apr 22 12:06:25 host-b nebula[111]: time="2024-04-22T12:06:25-00:00" level=info msg="Send handshake via relay" localIndex=1813799298 relay=172.0.0.2 remoteIndex=0 vpnIp=172.0.3.109
Apr 22 12:06:25 host-b nebula[111]: time="2024-04-22T12:06:25-00:00" level=info msg="Send handshake via relay" localIndex=1813799298 relay=172.0.0.3 remoteIndex=0 vpnIp=172.0.3.109
Apr 22 12:06:25 host-b nebula[111]: time="2024-04-22T12:06:25-00:00" level=info msg="Send handshake via relay" localIndex=1813799298 relay=172.0.0.2 remoteIndex=0 vpnIp=172.0.3.109
Apr 22 12:06:25 host-b nebula[111]: time="2024-04-22T12:06:25-00:00" level=info msg="Send handshake via relay" localIndex=1813799298 relay=172.0.0.3 remoteIndex=0 vpnIp=172.0.3.109
Apr 22 12:06:26 host-b nebula[111]: time="2024-04-22T12:06:26-00:00" level=info msg="Handshake timed out" durationNs=6152868332 handshake="map[stage:1 style:ix_psk0]" initiatorIndex=1813799298 localIndex=1813799>
Apr 22 12:06:30 host-b nebula[111]: time="2024-04-22T12:06:30-00:00" level=info msg="Handshake message sent" handshake="map[stage:1 style:ix_psk0]" initiatorIndex=3495069400 localIndex=3495069400 remoteIndex=0 u>
Apr 22 12:06:30 host-b nebula[111]: time="2024-04-22T12:06:30-00:00" level=info msg="Attempt to relay through hosts" localIndex=3495069400 relays="[172.0.0.2 172.0.0.3 172.0.0.2 172.0.0.3]" remoteIndex=0 vpnIp=1>
Apr 22 12:06:30 host-b nebula[111]: time="2024-04-22T12:06:30-00:00" level=info msg="Send handshake via relay" localIndex=3495069400 relay=172.0.0.2 remoteIndex=0 vpnIp=172.0.3.109
Apr 22 12:06:30 host-b nebula[111]: time="2024-04-22T12:06:30-00:00" level=info msg="Send handshake via relay" localIndex=3495069400 relay=172.0.0.3 remoteIndex=0 vpnIp=172.0.3.109

This pattern repeats

Config files from affected hosts

Host A 
firewall:
  conntrack:
    default_timeout:    10m
    max_connections:    100000
    tcp_timeout:        12m
    udp_timeout:        3m
  inbound:
  - host:               any
    port:               any
    proto:              icmp
  - host:               any
    port:               any
    proto:              any
  outbound:
  - host:               any
    port:               any
    proto:              any
lighthouse:
  am_lighthouse:        false
  hosts:
  - 172.0.0.2
  - 172.0.0.3
  interval:             60
listen:
  batch:                128
  host:                 0.0.0.0
  port:                 0
  read_buffer:          10485760
  write_buffer:         10485760
logging:
  format:               text
  level:                info
pki:
  ca:                   |
  cert:                 |
  key:                  |
punchy:
  delay:                1s
  punch:                true
  punch_back:           true
  respond:              true
relay:
  am_relay:             false
  relays:
  - 172.0.0.2
  - 172.0.0.3
  use_relays:           true
static_host_map:
  172.0.0.2:
  - ....:4242
  172.0.0.3:
  - ....:4242
tun:
  dev:                  nebula1
  disabled:             false
  drop_local_broadcast: false
  drop_multicast:       false
  routes:               null
  tx_queue:             5000
  unsafe_routes:        null
Host B 
firewall:
  conntrack:
    default_timeout:    10m
    max_connections:    100000
    tcp_timeout:        12m
    udp_timeout:        3m
  inbound:
  - host:               any
    port:               any
    proto:              icmp
  - host:               any
    port:               any
    proto:              any
  outbound:
  - host:               any
    port:               any
    proto:              any
lighthouse:
  am_lighthouse:        false
  hosts:
  - 172.0.0.2
  - 172.0.0.3
  interval:             60
listen:
  batch:                128
  host:                 0.0.0.0
  port:                 0
  read_buffer:          10485760
  write_buffer:         10485760
logging:
  format:               text
  level:                info
pki:
  ca:                   |
  cert:                 |
  key:                  |
preferred_ranges:
- 10.0.0.0/24
punchy:
  delay:                1s
  punch:                true
  punch_back:           true
  respond:              true
relay:
  am_relay:             false
  relays:
  - 172.0.0.2
  - 172.0.0.3
  use_relays:           true
static_host_map:
  172.0.0.2:
  - ....:4242
  172.0.0.3:
  - ....:4242
tun:
  dev:                  nebula1
  disabled:             false
  drop_local_broadcast: false
  drop_multicast:       false
  routes:               null
  tx_queue:             5000
  unsafe_routes:        null
Lighthouse 
firewall:
  conntrack:
    default_timeout: 10m
    max_connections: 100000
    tcp_timeout: 12m
    udp_timeout: 3m
  inbound:
  - host: any
    port: any
    proto: icmp
  - host: any
    port: any
    proto: any
  outbound:
  - host: any
    port: any
    proto: any
lighthouse:
  am_lighthouse: true
  interval: 60
listen:
  batch: 128
  host: 0.0.0.0
  port: 4242
logging:
  format: text
  level: debug
pki:
  ca: |
  cert: |
  key: |
punchy:
  delay: 1s
  punch: true
  punch_back: true
  respond: true
relay:
  am_relay: true
  use_relays: false
stats:
  host: ...:2003
  interval: 10s
  lighthouse_metrics: true
  message_metrics: true
  prefix: nebula.cloud_proxy
  protocol: tcp
  type: graphite
tun:
  dev: nebula1
  disabled: false
  drop_local_broadcast: false
  drop_multicast: false
  routes: null
  tx_queue: 5000
  unsafe_routes: null
commented

Also worth noting that this issue doesn't occur after a normal reboot.

commented

On the surface this looks like a nebula IP reuse issue but there's so much redacted that it's hard to understand exactly what is happening.

Apr 22 12:13:31 cloud-proxy nebula[689]: time="2024-04-22T12:13:31-00:00" level=debug msg="Recv error sent" index=0 udpAddr="<host's external IP>:5694"
  • Does the <host's external IP> ever change or is it always the same?
  • Does it actually say index=0?

Both Host A and Host B appear to be attempting to initiate a tunnel with the other but neither logs show a matching handshake despite Host A responding. This means we should see logs on Host A responding to handshakes initiated by Host B.

To help can you do the following:

  • Ensure that multiple processes aren't running using the same nebula ip (the ip issued in the certificate)
  • Provide more, unredacted logs from all hosts. You can send to my email if you are concerned about privacy nate@defined.net
commented

Great, I've sent you an email.

And there aren't multiple processes running. It's controlled by systemd.