Weave 1.2.0

Highlights

This release introduces the Fast Data Path, which allows Weave networks to operate at near wire-level speeds. This new feature is enabled by default.

Other highlights:

• auto-configuration of TLS for the Weave Docker API proxy, making it
  easier to run Weave on Macs and in conjunction with tools like
  Docker Swarm
• support for Docker restart policies on application containers and weave
  infrastructure containers
• better compatibility with recent and future Docker versions

More details below and in the change log.

Installation and Upgrading

Follow the installation instructions to install this latest release of weave.

Weave 1.2.0 is fully compatible with Weave 1.1.x, so it is possible to upgrade clusters incrementally and run mixed versions. If upgrading from Weave 1.0.x, take into account the Weave 1.1.0 upgrading instructions.

(Once upgraded, if you then decide to re-install weave 1.1 take care to run weave reset before downgrading. Failing that, reboot the machine)

Changes

Router

• introduce Fast Data Path,
  which significantly improves network
  performance. #36/#205/#991/#1438, #1396/#1451, #1448/#1522, #1505/#1513/#1525, #1510/#1526, #1533/#1538, #1544, #1548/#1550, #1558, #1552/#1562, #1567, #1570
• apply back-off on late connection failures. Previously, errors
  detected shortly after connection establishment would cause
  immediate retries, causing high connection churn and log
  noise. #953/#1447/#1496
• handle a race conditions that could cause multiple concurrent
  connection attempts to the same IP/port of a prospective
  peer. #1478/#1479/#1483
• remove spurious Docker dependency, allowing the router executable to
  be run w/o accessing Docker. #1443/#1500

Docker API proxy

• auto-configure
  TLS. This
  simplifies setting up weave on Mac OSX and other platforms where
  Docker is only accessible via TLS. #1285/#1414/#1441/#1442, #1407
• when containers started via the proxy are restarted by Docker, the
  proxy automatically re-attaches them to the weave
  network. #401/#1210/#1456, #1547/#1551, #1542/#1560
• when the weave router is restarted by Docker, the proxy
  automatically re-attaches it to the weave network. #401/#1358/#1518
• cope with HostConfig on start, which is a backward compatibility
  feature of the Docker API used by some
  applications. Previously, containers started that way would end up
  with a broken configuration, such as lack of DNS
  settings. #1368/#1449, #1481/#1488, #1531/#1532/#1534
• work with non-default logging driver. Previously this would cause
  the proxy launch to report a failure even when it
  succeeded. #1453/#1472/#1474,#1519/#1520, #1527/#1528
• improve Docker version compatibility. New (present and future)
  Docker features and associated changes to the Docker Remote API are
  now handled correctly in the vast majority of cases. #1371/#1395
• log requests/responses when running with
  --log-level=debug. #1515/#1536
• remove /var/run/weave.sock symlink, which was there for backward
  compatibility with weave 1.0. Newer versions use
  /var/run/weave/weave.sock. #1492/#1495

IP Address Allocator

• gracefully handle situations where IP address allocation has been
  seeded by different peers, e.g. because incorrect
  --init-peer-count values were specified. Previously this could
  cause the router to crash or log obscure errors. Now it causes the
  connection between the incompatibly-initialised peers to be dropped,
  with an intelligible error in the logs and weave status connections output. #1178/#1463/#1499
• do not allocate IP addresses in weave detach/hide. This was
  causing these commands to hang when IP address allocation was
  deferred (e.g. due to the lack of initial consensus or free
  addresses). #860/#1503
• prevent stall of docker run/start and weave run/attach when a
  container dies just before IP address allocation, and IP address
  allocation is deferred (e.g. due to the lack of initial consensus or
  free addresses). #1459/#1512

Naming and Discovery (weaveDNS)

• prevent Docker from updating a container's
  /etc/hosts,
  which, from Docker 1.8 onward, was breaking resolution of
  unqualified names via weaveDNS. #1374/#1477, #1574
• add an entry to /etc/hosts for the container's fully-qualified
  hostname and weave IP addresses, which is expected by some
  applications. #1497/#1557
• enable weave dns-add/remove
  to add/remove DNS records not associated with containers. #1385/#1517
• make name resolution case insensitive, per
  RFC1035. #1461/#1462

CLI

• correctly report the version of snapshot releases. #1341/#1415
• rename VERSION env var to WEAVE_VERSION, to prevent accidental
  conflicts. #1389
• start temporary containers without networking, where possible, which speeds up some weave commands. #1572

Build & Test

• make weave build & work with Go 1.5. #1386/#1393/#1412/#1436
• switch from 'gliderlabs/alpine' to 'alpine' images, since the latter
  is now the official name for this image. #1388
• restrict coverage reporting to sub-packages of 'weave', thus
  producing more accurate coverage statistics. #1524
• add test for using sub-domains with weaveDNS. #1446
• fix a race condition in an integration test that lead to sporadic
  failures. #1502/#1537
• work around a bug in Docker 1.9rc1 that breaks an integration test. #1565/#1569
• use test scripts from build-tools
  repo, for sharing with
  other projects. #1470
• run unit tests in a separate container (instead of the build
  container) in CircleCI. #1204/#1469
• build GCE test image on demand, streamlining the workflow for
  updating the images. #1468/#1494