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Description of problem:
I have seen following issues with flannel on rhel7:

1. When flannel is uninstalled, the dir /usr/libexec/flannel is not cleaned up.

2. Env var used for the flags etcd-endpoints and etcd-prefix are not canonical:

The correct ones are:
etcd-endpoints:  FLANNELD_ETCD_ENDPOINTS
etcd-prefix: FLANNELD_ETCD_PREFIX

The flannel rpm uses:
etcd-endpoints: FLANNEL_ETCD
etcd-prefix: FLANNEL_ETCD_KEY

Version-Release number of selected component (if applicable):
0.5.3-9.el7

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:

As this is RFE, let's make the flannel more shiny not before 7.3.

So I don't think systemd variable expansion handles that syntax...

I think we'd have to make a helper script which runs bash to handle this...

I'd rather we just doc'd it, but if we have to fix it, I think it needs to be a helper script called by ExecStart which actually launches flannel a Jan suggested...

Test with flannel-0.5.5-2 and the uninstall and conf files are all as expect.

Details:
1. use ls to check flannel after uninstall:
# ls /usr/libexec/flannel
ls: cannot access /usr/libexec/flannel: No such file or directory

2. flannel conf file content:

# Flanneld configuration options  

# etcd url location.  Point this to the server where etcd runs
FLANNEL_ETCD_ENDPOINTS="https://127.0.0.1:2379"

# etcd config key.  This is the configuration key that flannel queries
# For address range assignment
FLANNEL_ETCD_PREFIX="/atomic.io/network"
....

So set this to verified.