Delegate host configuration variables
The tables in this section provide an overview of the serviced configuration variables that apply to Control Center delegate hosts. Set these variables as required for your environment or applications.
Delegate variables
The following miscellaneous variables apply only to delegate hosts.
| Variable | Description |
|---|---|
| SERVICED_ZK | The list of hosts in the ZooKeeper |
| SERVICED_STATS_PERIOD | The frequency at which delegates gather metrics to send to the master host. |
| SERVICED_IPTABLES_MAX_CONNECTIONS | The maximum number of open connections to allow on a delegate. The number increases when the master is unavailable and decreases when the master returns to service. |
Internal services endpoint variables
The variables in the following table must be set identically on all Control Center delegate hosts.
The SERVICED_AUTH_TOKEN_EXPIRATION variable affects RPC, mux, and internal services endpoint traffic.
| Variable | Endpoint | Description |
|---|---|---|
| SERVICED_DOCKER_REGISTRY | (varies) | The local Docker registry for Control Center internal services images and application images. |
| SERVICED_ENDPOINT | Master-Host:4979 | The serviced RPC server. The endpoint port number must match the value of SERVICED_RPC_PORT. |
| SERVICED_LOG_ADDRESS | Master-Host:5042 | The logstash service. |
| SERVICED_LOGSTASH_ES | Master-Host:9100 | The Elasticsearch service for logstash. |
| SERVICED_STATS_PORT | Master-Host:8443 | The serviced metrics consumer service. |
| SERVICED_AUTH_TOKEN_EXPIRATION | (none) | The length of time a delegate authentication token is valid. |
RPC service variables
The variables in the following table must be set identically on all Control Center hosts, except:
- SERVICED_RPC_PORT, set only on the master
- SERVICED_MAX_RPC_CLIENTS, set only on delegates
By default, serviced uses TLS to encrypt all RPC traffic. The SERVICED_KEY_FILE and SERVICED_CERT_FILE variables identify the digital certificate used for RPC, mux, and HTTP traffic.
The SERVICED_AUTH_TOKEN_EXPIRATION variable affects RPC, mux, and internal services endpoint traffic.
| Variable | Where to set |
|---|---|
| SERVICED_ENDPOINT | Master, delegates |
| SERVICED_MAX_RPC_CLIENTS | Delegates |
| SERVICED_RPC_PORT | Master |
| SERVICED_RPC_CERT_VERIFY | Master, delegates |
| SERVICED_RPC_DISABLE_TLS | Master, delegates |
| SERVICED_RPC_TLS_MIN_VERSION | Master, delegates |
| SERVICED_RPC_TLS_CIPHERS | Master, delegates |
| SERVICED_KEY_FILE | Master |
| SERVICED_CERT_FILE | Master |
| SERVICED_RPC_DIAL_TIMEOUT | Master, delegates |
| SERVICED_AUTH_TOKEN_EXPIRATION | Master |
Multiplexer variables
The variables in the following table must be set identically on all Control Center hosts.
By default, serviced uses TLS to encrypt all mux traffic. The SERVICED_KEY_FILE and SERVICED_CERT_FILE variables identify the digital certificate used for RPC, mux, and HTTP traffic.
The SERVICED_AUTH_TOKEN_EXPIRATION variable affects RPC, mux, and internal services endpoint traffic.
| Variable | Where to set |
|---|---|
| SERVICED_MUX_PORT | Master, delegates |
| SERVICED_MUX_DISABLE_TLS | Master, delegates |
| SERVICED_MUX_TLS_MIN_VERSION | Master, delegates |
| SERVICED_MUX_TLS_CIPHERS | Master, delegates |
| SERVICED_KEY_FILE | Master |
| SERVICED_CERT_FILE | Master |
| SERVICED_AUTH_TOKEN_EXPIRATION | Master |