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resin.properties: standard configuration
Most common Resin properties are configured by resin.properties. The resin.properties variables are used by the main resin.xml configuration file.
The resin.properties file is a condensed configuration for the most common Resin configurations. Since it is a set of variables used by the main resin.xml confguration file, the variables are defined by convention. The sections following show some of the most common configurations, followed by a description of the variables. The resin.properties is in the same directory as resin.xml. In unix systems as /etc/resin.properties. In systems deployed in a single directory, it will be ${resin.home}/conf/resin.properties. Example: key resin.properties ... app_servers : 127.0.0.1:6800 app.http : 8080 setuid_user : resin setuid_group : resin jvm_args : -Xmx2G -XX:MaxPermSize=256m ... Qualifying properties by cluster or serverProperties can be restricted to a server or a cluster by prefixing the variable by the cluster or server name. For example, a http port can be specific to the server named 'app-0' by using app-0.http. The port can be specific to the cluster 'app' with app.http. Example: http restrictions http : 8080 # default value if unspecified app-0.http : 8081 # server 'app-0' uses 8082 app-1.http : 8082 # server 'app-0' uses 8082 app.http : 8089 # servers in 'app' cluster use 8089 web.http : 8090 # servers in 'web' cluster use 8090 Extending resin.properties in custom resin.xmlBecause the resin.properties variables are defined by the resin.xml, sites that use their own custom resin.xml can define their own variables in their resin.xml and set those variables in the resin.properties. For custom users, the resin.properties is read using a <resin:properties> tag in the resin.xml. The variables are used with the standard EL values. Example: resin.xml import and use of resin.properties
<resin xmlns="http://caucho.com/ns/resin"
xmlns:resin="urn:java:com.caucho.resin">
<resin:properties path="${__DIR__}/resin.properties" optional="true"/>
<dependency-check-interval>${my_var?:'2s'}</dependency-check-interval>
...
</resin>
The previous example defines the dependency-check-interval using a resin.properties variable my_var and a default value of 2s. A basic application server configuration needs a few key properties to configure the HTTP port, the servers in the cluster, the operating system user and the JVM arguments for memory and GC. Each server in the cluster can have the same resin.xml and resin.properties. On start, Resin will detect which server is the local one, select it and start it. Example: key resin.properties ... app_servers : 127.0.0.1:6800 app.http : 8080 setuid_user : resin setuid_group : resin jvm_args : -Xmx2G -XX:MaxPermSize=256m ... The server names configured by app_servers are generated automatically by position: app-0, app-1, ..., app-n.
app.http configures the HTTP port for the 'app' cluster. The http defines the variable used in the resin.xml, and the app restricts it to servers in defined by app_servers. This system allows for different http ports when starting multiple servers on the same machine, like a web-tier load balancer, an app-tier server, and an memcached server. This web tier configuration has one web server that handles the HTTP, load balancing, and proxy caching, and one application server that runs the servlet applications. The web server load balances and proxies HTTP requests to the backend application cluster. To scale up, add more servers to app_servers. Example: web-tier resin.properties ... web_servers : 127.0.0.1:6810 web.http : 80 proxy_cache_enable : true proxy_cache_size : 256m app_servers : 127.0.0.1:6800 app.http : 8080 setuid_user : resin setuid_group : resin jvm_args : -Xmx2G -XX:MaxPermSize=256m ... The server names configured by web_servers are generated automatically by position: web-0, web-1, ..., web-n. Example: CLI starting the servers # resinctl start-all The start-all command-line will start both servers in the example because both servers are listening to a local port. To configure Resin as a memcached server, add IP:port addresses to the memcached_servers configuration. Example: memcached-tier resin.properties ... memcached_servers : 127.0.0.1:6820 memcached_port : 11211 memcached.http : 8080 The memcached.http is used for the /resin-admin managment and REST administration. accept_thread_max limits the maximum threads waiting for a new connection on the port. Higher values are more resilient to connection spikes because the idle threads are ready and waiting. In general, the default value is reasonable and does not usually need changing. Example: accept_thread_max ... accept_thread_max : 32 accept_thread_min : 4 ... accept_thread_min triggers a new thread to listen for connections when the number of waiting threads drops below the limit. It works with accept_thread_max to manage the threads waiting in the accept state. Higher values can improve connection spike resposiveness. In general, the default value is reasonable and does not usually need changing. Example: accept_thread_min ... accept_thread_max : 32 accept_thread_min : 4 ... admin_password is the password used with admin_user for /resin-admin administration, REST, and remote resinctl CLI administration. admin_password is generated with either the CLI resinctl generate-password or the /resin-admin login screen. Example: admin_user in resin.properties
...
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
web_admin_enable : true
web_admin_ssl : true
web_admin_external : false
remote_cli_enable : false
rest_admin_enable : true
rest_admin_ssl : true
...
Example: resinctl generate-password
unix> resinctl generate-password my-admin my-password
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
admin_user creates a login user name for /resin-admin administration, REST, and remote resinctl CLI administration. It is used with admin_password and web_admin_enable. admin_password is generated with either the CLI resinctl generate-password or the /resin-admin login screen. Example: admin_user in resin.properties
...
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
web_admin_enable : true
web_admin_ssl : true
web_admin_external : false
remote_cli_enable : false
rest_admin_enable : true
rest_admin_ssl : true
...
Example: resinctl generate-password
unix> resinctl generate-password my-admin my-password
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
The HTTP port for the 'app' cluster. The "app." is a prefix to the http property, restricting it to the named cluster, "app". Example: app.http ... app.http : 8080 ... The HTTPS port for the 'app' cluster. The "app." is a prefix to the https property, restricting it to the named cluster, "app". app.https is generally used with openssl_file, openssl_key and openssl_password. Example: app.https ... app.https : 8443 ... cluster_system_key configures a shared secret across Resin servers in a cluster. The shared secret is checked when servers in the cluster connect. The key can be any string. Example: cluster_system_key cluster_system_key : ms8cntp8743z dependency_check_interval sets how often Resin will check for updated files. In development this will be a small value. In deployment it can be a larger value. Example: dependency_check_interval dependency_check_interval : 2m elastic_cloud_enable lets dynamic servers join a cluster. If the "start" command either has an "--elastic-server" flag or if the elastic_server property is set, Resin will connect to the cluster as a new dynamic server. The cluster is either specified by "--cluster foo" or the home_cluster property. The cluster triad hub servers are specified by the app_servers property. Example: elastic_cloud_enable app_servers : 182.168.1.10:6800 elastic_server : true elastic_cloud_enable : true home_cluster : app To start a dynamic server, use resinctl with start and specify --elastic-server to force a dynamic server. The --cluster is optional if a home-cluster has been defined. Example: elastic_cloud_enable # resinctl start --elastic-server --cluster app elastic_dns is used in cloud environments that assign IP addresses or DNS names after the server starts, for example in an EC2 environment. When elastic_dns is enabled, Resin will start the server, wait and retry until the local IP addresses or DNS resolve to a matching server. For example, a Resin cluster might have a fixed pre-allocated DNS name of "app0.mydomain" and app_servers might include that address. At server boot time, the cloud assigns the dynamic IP 192.168.2.114. Later the cloud or the user will attach the IP to the DNS name "app0.mydomain". Resin will then recognize it and start with the correct value.
Example: elastic_dns app_servers : app0.mydomain:6800 elastic_dns : true You can specify the elastic_dns in the resin.properties or equivalently specify it on the command line as --elastic-dns. Example: CLI elastic-dns # resinctl start-all --elastic-dns elastic_server starts the server as a dynamic server and joins a cluster. The dynamic server must have a hub server configured in the cluster to register itself. The cluster must also have the elastic_cloud_enable set to enable dynamic servers. When the "start" command either has an "--elastic-server" flag or if the elastic_server property is set, Resin will connect to the cluster as a new dynamic server. The cluster is either specified by "--cluster foo" or the home_cluster property. The cluster triad hub servers are specified by the app_servers property.
Example: elastic_server app_servers : 182.168.1.10:6800 elastic_server : true elastic_cloud_enable : true home_cluster : app To start a dynamic server, use resinctl with start and specify --elastic-server or elastic_server in the resin.properties to force a dynamic server. The --cluster is optional if a home-cluster has been defined. Example: elastic_server # resinctl start --elastic-server --cluster app email is an admin email address used to send automatic reports like weekly PDF reports. Example: email email : myuser@admin.example.org The HTTP port for all servers, usually restricted to the cluster or server as app.http or web.http. If the plain http property is used, it is the default http for all servers. Example: http ... http : 8080 app.http : 8081 # overrides for a server in cluster 'app' ... http_address selects a specific IP address and port for HTTP. It can be useful when each server needs to bind to a different address. The http_address can be qualified by the cluster or the individual server like other properties. For example, app-0.http_address configures the address for server app-0 in the app cluster. Example: http_address ... app-0.http_address : 192.168.1.10 app-1.http_address : 192.168.1.11 app.http : 8080 ... http_ping_urls is a list of URLs to check for server reliability. Resin's health system will periodically check the URLs on the current server. If the server does not respond, the health system will force an automatic restart of Resin. Example: http_ping_urls http_ping_urls : http://www.myfoo.com/my-test http://www.mybar.com/my-test2 jvm_args defines the JDK memory and GC parameters to start the Resin process. Example: jvm_args jvm_args : -Xmx2G -XX:MaxPermSize=256m openssl_file configures the OpenSSL *.crt certificate file when using SSL. The file location is relative to the resin.xml file. Example: openssl_file app.https : 8443 openssl_file : keys/foo.crt openssl_key : keys/foo.key openssl_password : my-password openssl_key configures the OpenSSL *.key key file when using SSL. The file location is relative to the resin.xml file. Example: openssl_key app.https : 8443 openssl_file : keys/foo.crt openssl_key : keys/foo.key openssl_password : my-password openssl_password configures the password for OpenSSL key file when using SSL. Example: openssl_key app.https : 8443 openssl_file : keys/foo.crt openssl_key : keys/foo.key openssl_password : my-password port_thread_max restricts the active threads available for a single port. Connections beyond the limit will use the async/select manager, and queue for an available thread. port_thread_max can be used to limit the maximum load on an overloaded system. If more connection arrive than port_thread_max and beyond the select manager, they will be delayed instead of overloading the system. Example: port_thread_max ... port_thread_max : 256 accept_thread_max : 32 accept_thread_min : 4 properties_import_url adds a new properties file to be processed after the resin.properties. Cloud servers using EC2-style /user-data can use the url to customize properties for each server. Example: properties_import_url for EC2 ... properties_import_url : http://169.254.169.254/latest/user-data proxy_cache_enable enables Resin's HTTP proxy cache. The proxy cache improves performance by saving the server's generated pages. It can be used for formatted web pages or REST-style GET pages that change infrequently. Example: proxy_cache_enable proxy_cache_enable : true proxy_cache_size : 256m proxy_cache_size is the size of the in-memory proxy cache size. The actual maximum size is much larger, because the memory is used as a block cache for a disk based store. The memory block cache is also used for distributed caching. Example: proxy_cache_size proxy_cache_enable : true proxy_cache_size : 256m remote_cli_enable enables the CLI resinctl to be used for remote servers. By default the CLI is restricted to the local network. Example: remote_cli_enable remote_cli_enable : true rest_admin_enable enables REST-based administration of a Resin server. REST can be used to integrate Resin with remote administration consoles or status scripts. rest_admin_enable requires an admin_user and admin_password for security. It can optionally be restricted to SSL ports with resin_admin_ssl. Example: rest_admin_enable in resin.properties
...
rest_admin_enable : true
rest_admin_ssl : true
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
...
rest_admin_ssl requires an SSL connection for REST-based administration of a Resin server. REST can be used to integrate Resin with remote administration consoles or status scripts. Example: rest_admin_ssl in resin.properties
...
rest_admin_enable : true
rest_admin_ssl : true
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
...
sendfile enables operating system sendfile() call, which will send an entire file without requiring Resin to read the file itself. sendfile is particularly useful when much of the traffic is large static files. Example: sendfile ... sendfile : true tcp_cork : true session_store enables clustered persistent sessions for failover. Example: session_store ... session_store : true ... On unix, setuid_user runs the Resin instance as the specified user for security. Example: setuid_user ... setuid_user : resin setuid_group : resin ... On unix, setuid_group runs the Resin instance as the specified group for security. Example: setuid_group ... setuid_user : resin setuid_group : resin ... tcp_cork enables advanced TCP flow control on Linux systems for improved performance of large files. When it is enabled, sent data will be buffered in the operating system until the buffers fill, instead of being sent out with partial buffers. An application flush() will still force the data to be sent out. Example: tcp_cork ... tcp_cork : true web_admin_enable enables /resin-admin for a Resin server. /resin-admin can show the server status, report statistics graphs, deploy applications, and generate PDF reports. web_admin_enable requires an admin_user and admin_password for security. It can optionally be restricted to SSL ports with web_admin_ssl. Example: web_admin_enable in resin.properties
...
web_admin_enable : true
web_admin_ssl : true
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
...
web_admin_external enables /resin-admin access for servers outside the local network. If enabled, it should be always used with web_admin_ssl. Example: web_admin_external in resin.properties
...
web_admin_enable : true
web_admin_external : true
web_admin_ssl : true
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
...
web_admin_ssl requires an SSL connection for /resin-admin administration of a Resin server. /resin-admin can show the server status, report statistics graphs, deploy applications, and generate PDF reports. Example: web_admin_ssl in resin.properties
...
web_admin_enable : true
web_admin_ssl : true
admin_user : my-admin
admin_password : {SSHA}G3UOLv0dkJHTZxAwmhrIC2CRBZ4VJgTB
...
webapp_multiversion_routing is a deployment versioning system where Resin selects the most recent deployed application. Web-apps named with numeric suffixes, e.g. foo-10.0.war and can be browsed as /foo. When a new version of the web-app is deployed, Resin continues to route active session requests to the previous web-app version while new sessions go to the new version, so users will not be aware of the application upgrade. Example: webapp_multiversion_routing ... webapp_multiversion_routing : true ...
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