github.com/hashicorp/consul

FEATURES:

• Key rotation support for gossip layer. This allows the encrypt key to be changed globally. See "keyring" command. [GH-336]
• Options to join the WAN pool on start (start_join_wan, retry_join_wan) [GH-477]
• Optional HTTPS interface [GH-478]
• Ephemeral keys via "delete" session behavior. This allows keys to be deleted when a session is invalidated instead of having the lock released. Adds new "Behavior" field to Session which is configurable. [GH-487]
• Reverse DNS lookups via PTR for IPv4 and IPv6 [GH-475]
• API added checks and services are persisted. This means services and checks will survive a crash or restart. [GH-497]
• ACLs can now protect service registration. Users in blacklist mode should allow registrations before upgrading to prevent a service disruption. [GH-506] [GH-465]
• Sessions support a heartbeat failure detector via use of TTLs. This adds a new "TTL" field to Sessions and a /v1/session/renew endpoint. Heartbeats act like a failure detector (health check), but are managed by the servers. [GH-524] [GH-172]
• Support for service specific IP addresses. This allows the service to advertise an address that is different from the agent. [GH-229] [GH-570]
• Support KV Delete with Check-And-Set [GH-589]
• Merge armon/consul-api into api as official Go client.
• Support for distributed locks and semaphores in API client [GH-594] [GH-600]
• Support for native HTTP health checks [GH-592]
• Support for node and service maintenance modes [GH-606]
• Added new "consul maint" command to easily toggle maintenance modes [GH-625]
• Added new "consul lock" command for simple highly-available deployments. This lets Consul manage the leader election and easily handle N+1 deployments without the applications being Consul aware. [GH-619]
• Multiple checks can be associated with a service [GH-591] [GH-230]

BUG FIXES:

• Fixed X-Consul-Index calculation for KV ListKeys
• Fixed errors under extremely high read parallelism
• Fixed issue causing event watches to not fire reliably [GH-479]
• Fixed non-monotonic X-Consul-Index with key deletion [GH-577] [GH-195]
• Fixed use of default instead of custom TLD in some DNS responses [GH-582]
• Fixed memory leaks in API client when an error response is returned [GH-608]
• Fixed issues with graceful leave in single-node bootstrap cluster [GH-621]
• Fixed issue preventing node reaping [GH-371]
• Fixed gossip stability at very large scale
• Fixed string of rpc error: rpc error: ... no known leader. [GH-611]
• Fixed panic in exec during cancellation
• Fixed health check state reset caused by SIGHUP [GH-693]
• Fixed bug in UI when multiple datacenters exist.

IMPROVEMENTS:

• Support "consul exec" in foreign datacenter [GH-584]
• Improved K/V blocking query performance [GH-578]
• CLI respects CONSUL_RPC_ADDR environment variable to load parameter [GH-542]
• Added support for multiple DNS recursors [GH-448]
• Added support for defining multiple services per configuration file [GH-433]
• Added support for defining multiple checks per configuration file [GH-433]
• Allow mixing of service and check definitions in a configuration file [GH-433]
• Allow notes for checks in service definition file [GH-449]
• Random stagger for agent checks to prevent thundering herd [GH-546]
• More useful metrics are sent to statsd/statsite
• Added configuration to set custom HTTP headers (CORS) [GH-558]
• Reject invalid configurations to simplify validation [GH-576]
• Guard against accidental cluster mixing [GH-580] [GH-260]
• Added option to filter DNS results on warning [GH-595]
• Improve write throughput with raft log caching [GH-604]
• Added ability to bind RPC and HTTP listeners to UNIX sockets [GH-587] [GH-612]
• K/V HTTP endpoint returns 400 on conflicting flags [GH-634] [GH-432]

MISC:

• UI confirms before deleting key sub-tree [GH-520]
• More useful output in "consul version" [GH-480]
• Many documentation improvements
• Reduce log messages when quorum member is logs [GH-566]

UPGRADE NOTES:

• If acl_default_policy is "deny", ensure tokens are updated to enable service registration to avoid a service disruption. The new ACL policy can be submitted with 0.4 before upgrading to 0.5 where it will be enforced.

• Servers running 0.5.X cannot be mixed with older servers. (Any client version is fine). There is a 15 minute upgrade window where mixed versions are allowed before older servers will panic due to an unsupported internal command. This is due to the new KV tombstones which are internal to servers.