参考文档：
Easyrsa #345
EasyRSA 3.0.8
etcd charm
部署过很多次基础架构高可用，没出现过问题，突然这次部署，easyrsa出现The easyrsa resource is missing. .。
开始困惑不解，因为以前没出现过问题，还以为以前是部署的openstack base #70，这次是部署openstack base 73，所以产生的问题。
但是又重新部署了下openstack base #70，发现还是The easyrsa resource is missing.
确定应该是网络链路的问题，没有办法访问以前能访问的earsyrsa资源。
研究了下文档，大概确认了下语法。
根据metadata.yaml中提到:
The release of the EasyRSA software you would like to use to create certificate authority (CA) and other Public Key Infrastructure (PKI). This charm was written using v3.0.1, so earlier versions of EasyRSA may not work. You can find the releases of EasyRSA at https://github.com/OpenVPN/easy-rsa/releases
wget https://github.com/OpenVPN/easy-rsa/releases/download/3.0.1/EasyRSA-3.0.1.tgz
再根据https://github.com/OpenVPN/easy-rsa/releases中语法：
juju attach etcd etcd=/path/to/new/etcd.snap
得到命令：
juju attach easyrsa easyrsa=./EasyRSA-3.0.1.tgz
注： 必须是使用.tgz后缀的文件。
juju status
output is：
# juju status
Model Controller Cloud/Region Version SLA Timestamp
openstack maas-controller mymaas/default 2.8.9 unsupported 22:23:20+08:00
App Version Status Scale Charm Store Rev OS Notes
ceph-mon 15.2.8 active 3 ceph-mon local 0 ubuntu
ceph-osd 15.2.8 active 3 ceph-osd local 15 ubuntu
ceph-radosgw 15.2.8 active 1 ceph-radosgw local 26 ubuntu
cinder 16.2.1 active 1 cinder local 136 ubuntu
cinder-ceph 16.2.1 active 1 cinder-ceph local 2 ubuntu
cinder-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
dashboard-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
easyrsa 3.0.1 active 1 easyrsa local 1 ubuntu
etcd 3.1.10 active 3 etcd local 0 ubuntu
glance 20.0.1 active 1 glance local 150 ubuntu
glance-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
keystone 17.0.0 active 1 keystone local 0 ubuntu
keystone-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
mysql-innodb-cluster 8.0.23 active 3 mysql-innodb-cluster local 0 ubuntu
neutron-api 16.2.0 active 1 neutron-api local 0 ubuntu
neutron-api-plugin-ovn 16.2.0 active 1 neutron-api-plugin-ovn local 0 ubuntu
neutron-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
nova-cloud-controller 21.1.1 active 1 nova-cloud-controller local 501 ubuntu
nova-compute 21.1.1 active 3 nova-compute local 133 ubuntu
nova-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
ntp 3.5 active 3 ntp local 0 ubuntu
openstack-dashboard 18.3.2 active 1 openstack-dashboard local 32 ubuntu
ovn-central 20.03.1 active 3 ovn-central local 0 ubuntu
ovn-chassis 20.03.1 active 3 ovn-chassis local 0 ubuntu
placement 3.0.0 active 1 placement local 0 ubuntu
placement-mysql-router 8.0.23 active 1 mysql-router local 0 ubuntu
rabbitmq-server 3.8.2 active 1 rabbitmq-server local 150 ubuntu
vault 1.5.4 active 3 vault local 0 ubuntu
vault-hacluster active 3 hacluster jujucharms 74 ubuntu
vault-mysql-router 8.0.23 active 3 mysql-router local 0 ubuntu
Unit Workload Agent Machine Public address Ports Message
ceph-mon/0 active idle 0/lxd/0 10.0.7.233 Unit is ready and clustered
ceph-mon/1 active idle 1/lxd/0 10.0.7.240 Unit is ready and clustered
ceph-mon/2* active idle 2/lxd/0 10.0.7.227 Unit is ready and clustered
ceph-osd/0* active idle 0 10.0.0.156 Unit is ready (1 OSD)
ceph-osd/1 active idle 1 10.0.0.157 Unit is ready (1 OSD)
ceph-osd/2 active idle 2 10.0.0.158 Unit is ready (1 OSD)
ceph-radosgw/0* active idle 0/lxd/1 10.0.7.238 80/tcp Unit is ready
cinder/0* active idle 1/lxd/1 10.0.7.242 8776/tcp Unit is ready
cinder-ceph/0* active idle 10.0.7.242 Unit is ready
cinder-mysql-router/0* active idle 10.0.7.242 Unit is ready
easyrsa/1* active idle 0/lxd/9 10.0.7.252 Certificate Authority connected.
etcd/0 active idle 0/lxd/7 10.0.7.248 2379/tcp Healthy with 3 known peers
etcd/1* active idle 1/lxd/7 10.0.7.250 2379/tcp Healthy with 3 known peers
etcd/2 active idle 2/lxd/7 10.0.7.249 2379/tcp Healthy with 3 known peers
glance/0* active idle 2/lxd/1 10.0.7.228 9292/tcp Unit is ready
glance-mysql-router/0* active idle 10.0.7.228 Unit is ready
keystone/0* active idle 0/lxd/2 10.0.7.237 5000/tcp Unit is ready
keystone-mysql-router/0* active idle 10.0.7.237 Unit is ready
mysql-innodb-cluster/0 active idle 0/lxd/3 10.0.7.236 Unit is ready: Mode: R/O
mysql-innodb-cluster/1 active idle 1/lxd/2 10.0.7.245 Unit is ready: Mode: R/O
mysql-innodb-cluster/2* active idle 2/lxd/2 10.0.7.231 Unit is ready: Mode: R/W
neutron-api/0* active idle 1/lxd/3 10.0.7.241 9696/tcp Unit is ready
neutron-api-plugin-ovn/0* active idle 10.0.7.241 Unit is ready
neutron-mysql-router/0* active idle 10.0.7.241 Unit is ready
nova-cloud-controller/0* active idle 0/lxd/4 10.0.7.239 8774/tcp,8775/tcp Unit is ready
nova-mysql-router/0* active idle 10.0.7.239 Unit is ready
nova-compute/0* active idle 0 10.0.0.156 Unit is ready
ntp/1 active idle 10.0.0.156 123/udp chrony: Ready
ovn-chassis/1 active idle 10.0.0.156 Unit is ready
nova-compute/1 active idle 1 10.0.0.157 Unit is ready
ntp/2 active idle 10.0.0.157 123/udp chrony: Ready
ovn-chassis/2 active idle 10.0.0.157 Unit is ready
nova-compute/2 active idle 2 10.0.0.158 Unit is ready
ntp/0* active idle 10.0.0.158 123/udp chrony: Ready
ovn-chassis/0* active idle 10.0.0.158 Unit is ready
openstack-dashboard/0* active idle 1/lxd/4 10.0.7.244 80/tcp,443/tcp Unit is ready
dashboard-mysql-router/0* active idle 10.0.7.244 Unit is ready
ovn-central/0 active idle 0/lxd/5 10.0.7.235 6641/tcp,6642/tcp Unit is ready (northd: active)
ovn-central/1 active idle 1/lxd/5 10.0.7.243 6641/tcp,6642/tcp Unit is ready
ovn-central/2* active idle 2/lxd/3 10.0.7.232 6641/tcp,6642/tcp Unit is ready (leader: ovnnb_db, ovnsb_db)
placement/0* active idle 2/lxd/4 10.0.7.229 8778/tcp Unit is ready
placement-mysql-router/0* active idle 10.0.7.229 Unit is ready
rabbitmq-server/0* active idle 2/lxd/5 10.0.7.230 5672/tcp Unit is ready
vault/0* active idle 0/lxd/6 10.0.7.234 8200/tcp Unit is ready (active: true, mlock: disabled)
vault-hacluster/0* active idle 10.0.7.234 Unit is ready and clustered
vault-mysql-router/0* active idle 10.0.7.234 Unit is ready
vault/1 active idle 1/lxd/6 10.0.7.247 8200/tcp Unit is ready (active: true, mlock: disabled)
vault-hacluster/1 active idle 10.0.7.247 Unit is ready and clustered
vault-mysql-router/1 active idle 10.0.7.247 Unit is ready
vault/2 active idle 2/lxd/6 10.0.7.246 8200/tcp Unit is ready (active: true, mlock: disabled)
vault-hacluster/2 active idle 10.0.7.246 Unit is ready and clustered
vault-mysql-router/2 active idle 10.0.7.246 Unit is ready
Machine State DNS Inst id Series AZ Message
0 started 10.0.0.156 node2 focal default Deployed
0/lxd/0 started 10.0.7.233 juju-700a13-0-lxd-0 focal default Container started
0/lxd/1 started 10.0.7.238 juju-700a13-0-lxd-1 focal default Container started
0/lxd/2 started 10.0.7.237 juju-700a13-0-lxd-2 focal default Container started
0/lxd/3 started 10.0.7.236 juju-700a13-0-lxd-3 focal default Container started
0/lxd/4 started 10.0.7.239 juju-700a13-0-lxd-4 focal default Container started
0/lxd/5 started 10.0.7.235 juju-700a13-0-lxd-5 focal default Container started
0/lxd/6 started 10.0.7.234 juju-700a13-0-lxd-6 focal default Container started
0/lxd/7 started 10.0.7.248 juju-700a13-0-lxd-7 focal default Container started
0/lxd/9 started 10.0.7.252 juju-700a13-0-lxd-9 focal default Container started
1 started 10.0.0.157 node1 focal default Deployed
1/lxd/0 started 10.0.7.240 juju-700a13-1-lxd-0 focal default Container started
1/lxd/1 started 10.0.7.242 juju-700a13-1-lxd-1 focal default Container started
1/lxd/2 started 10.0.7.245 juju-700a13-1-lxd-2 focal default Container started
1/lxd/3 started 10.0.7.241 juju-700a13-1-lxd-3 focal default Container started
1/lxd/4 started 10.0.7.244 juju-700a13-1-lxd-4 focal default Container started
1/lxd/5 started 10.0.7.243 juju-700a13-1-lxd-5 focal default Container started
1/lxd/6 started 10.0.7.247 juju-700a13-1-lxd-6 focal default Container started
1/lxd/7 started 10.0.7.250 juju-700a13-1-lxd-7 focal default Container started
2 started 10.0.0.158 node3 focal default Deployed
2/lxd/0 started 10.0.7.227 juju-700a13-2-lxd-0 focal default Container started
2/lxd/1 started 10.0.7.228 juju-700a13-2-lxd-1 focal default Container started
2/lxd/2 started 10.0.7.231 juju-700a13-2-lxd-2 focal default Container started
2/lxd/3 started 10.0.7.232 juju-700a13-2-lxd-3 focal default Container started
2/lxd/4 started 10.0.7.229 juju-700a13-2-lxd-4 focal default Container started
2/lxd/5 started 10.0.7.230 juju-700a13-2-lxd-5 focal default Container started
2/lxd/6 started 10.0.7.246 juju-700a13-2-lxd-6 focal default Container started
2/lxd/7 started 10.0.7.249 juju-700a13-2-lxd-7 focal default Container started