Nomad v0.8.4 is incompatible with Vault 0.11.0

Known Issue: Nomad v0.8.4 is incompatible with Vault 0.11.0

Affected Versions

• Nomad v0.8.4

Affected Platforms

• All

Summary

When Nomad attempts to connect to Vault v0.11.0 the following panic is emitted to the log and Vault will be unavailable to Nomad.

WARNING: keyring exists but -encrypt given, using keyring
==> Loaded configuration from /etc/nomad.d/base.hcl, /etc/nomad.d/client.hcl, /etc/nomad.d/server.hcl
==> Starting Nomad agent...
panic: interface conversion: interface {} is nil, not []interface {}

goroutine 67 [running]:
github.com/hashicorp/nomad/vendor/github.com/hashicorp/vault/api.(*Sys).Capabilities(0x13bd8dc8, 0x13b20181, 0x24, 0x13bfd17, 0x15, 0x0, 0x0, 0x0, 0x0, 0x0)
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/vault/api/sys_capabilities.go:38 +0x4c4
github.com/hashicorp/nomad/vendor/github.com/hashicorp/vault/api.(*Sys).CapabilitiesSelf(0x13bd8dc8, 0x13bfd17, 0x15, 0x0, 0x13784780, 0x76d6a6c8, 0x0, 0x0)
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/vault/api/sys_capabilities.go:6 +0x3c
github.com/hashicorp/nomad/nomad.(*vaultClient).hasCapability(0x13b821b0, 0x13bfd17, 0x15, 0x1f0d668, 0x2, 0x2, 0x22ac4, 0x13ac0320, 0x10, 0x10, ...)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/vault.go:753 +0x38
github.com/hashicorp/nomad/nomad.(*vaultClient).validateCapabilities(0x13b821b0, 0x13b1c8a1, 0xd, 0x139c4100, 0x0, 0x0)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/vault.go:696 +0x68
github.com/hashicorp/nomad/nomad.(*vaultClient).parseSelfToken(0x13b821b0, 0x1, 0x0)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/vault.go:668 +0x1a0
github.com/hashicorp/nomad/nomad.(*vaultClient).establishConnection(0x13b821b0)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/vault.go:428 +0x11c
github.com/hashicorp/nomad/nomad.(*vaultClient).(github.com/hashicorp/nomad/nomad.establishConnection)-fm()
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/vault.go:247 +0x1c
github.com/hashicorp/nomad/nomad.wrapNilError.func1(0x0, 0x1399d040)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/vault.go:1186 +0x1c
github.com/hashicorp/nomad/vendor/gopkg.in/tomb%2ev2.(*Tomb).run(0x139a8e40, 0x1370f718)
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/gopkg.in/tomb.v2/tomb.go:153 +0x1c
created by github.com/hashicorp/nomad/vendor/gopkg.in/tomb%2ev2.(*Tomb).Go
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/gopkg.in/tomb.v2/tomb.go:149 +0xa4

Resolutions

There are a few options to bring your cluster into a starting state:

• Upgrade to Vault version 0.11.1 or greater.
• Upgrade to Nomad version 0.8.5 or greater.