* navigation and initial steps of guide
* generate certs with appropriate token
* configure Nomad to use TLS
* add cli keys and certs
* add server gossip encryption section
* fix mislabeled steps
* vault paths formatting
* remove bit about cert revocation
* add clarification in challenge that we will be securing an existing Nomad cluster
* add some comments to consul-template.hcl to help user walk through it
* clarifying comments for CLI certs templates
* reorganize steps, change permissions on certs, and sub pkill command with systemctl reload nomad
* correct step reference
* add rpc upgrade mode instructions
* correct typo
This is a follow up work to https://github.com/hashicorp/nomad/pull/4813 to fix#4809 and fix a regression introduced in 0.9 in marking files in libcontainer executable.
#4809 bug is that `lookupBin` uses `exec.LookPath` when not inspecting task dir files. `exec.LookPath` only returns a file if it's already marked as an executable path in https://github.com/golang/go/blob/go1.12.1/src/os/exec/lp_unix.go#L24-L27 . This affects raw exec as if passed an absolute path to file, `lookupBin` returns an error if file isn't already an executable. This explains why the error manifests when an absolute interpolated path is used (e.g. `${NOMAD_TASK_DIR}/hellov1`) but not when using a task rel dir (e.g. `local/hellov1`) in the above examples used in ticket.
PR #4813 remedied this problem for raw exec but inadvertably broke libcontainer executor, as it made `lookupBin` returns the paths to host files rather than ones found inside chroot.
This PR reorders the evaluation, so we go back to 0.8 behavior of looking up task directories first, but then check for host paths before using `exec.LookPath`.
This PR is broken into three commits to illustrate evolution and confirming hypothesis:
1. 9adab75ac8 : Adding a test illustrating how libcontainer executor fails at marking processes as executable in https://travis-ci.org/hashicorp/nomad/jobs/514942694 - note that the test doesn't depend on artifacts or interpolated paths
2. d441cdd52f: reverting PR #4809 and showing the test fail now with raw_exec case (as expected) in https://travis-ci.org/hashicorp/nomad/jobs/514944065
2. 244544b735: in where we add the check in appropriate place next to `exec.LookPath(...)` for absolute paths and have a green job in https://travis-ci.org/hashicorp/nomad/jobs/514945024
## Future work
Inspecting `lookupBin` in 0.8 and 0.9 case, we have a bug in using `exec.LookPath` for the libcontainer executor case. We should be looking up paths based on the container chroot and container PATH rather than the host's. However, this is not a 0.9.0 regression and was present in 0.8; so punting to fix it post 0.9.
