压缩文件；以备拉取压缩包

sudo tar cvfz fabric-samples.tgz fabric-samples

（前一个fabric-samples代表压缩后压缩包名；后一个tabric-samples代表要压缩的文件名）

启动区块链 需要先找到链所在的目录；然后输入一下代码

~/fabric-samples/fabcar$ ./startFabric.sh

判断链是否在运行

docker ps

apt 的作用是安装软件的关键字

 Error while registering the user org.example.RegisterUser$1@4152d38d url: https://192.168.123.61:7054  POST request to https://192.168.123.61:7054 failed request body {"id":"appUser","type":"client","affiliation":"org1.department1","attrs":[]}. Response: {"result":"","errors":[{"code":0,"message":"Registration of 'appUser' failed: Identity 'appUser' is already registered"}
],"messages":[],"success":false} 

当客户端第二次申请注册用户时；并且申请的用户名一样（这里时appUser）时会报异常，更改一下用户名就可以解决

注册信息时；数据库中会有一个状态码 1/0；正常注册时，状态是1，如果注册过程中出现异常可能会导致状态是0，去ca库中 把user表和certificates表中删除掉已经注册过的用户信息（两个表都需要删除掉）然后；重新注册即可

打开ca库并查看表结构

 docker exec -it ca_org1 bash

进入etc/hyperledger并查看结构目录

cd /etc/hyperledger/

cd fabric-ca-server/

安装sqlite

apt-get install sqlite3

sqlite3 fabric-ca-server.db

查看表结构

.tables
# 查看用户
select *from users;

删除证书并更新查看

delete from certificates where id='appUser2';
update users set state=0 where id='appUser2';
select *from users;

跟踪日志输出

docker logs -f ca_org1

docker exec -it ca_org1 bash
sqlite3 fabric-ca-server.db
delete from certificaates where id='appUser2';
cd /etc/hyperledger/fabric-ca-server/
sqlite3 fabric-ca-server.db
.tables
select * from users;