首先给系统添加 epel 源。
curl -o /etc/yum.repos.d/epel-7.repo https://mirrors.aliyun.com/repo/epel-7.repo
安装证书申请工具 Certbot。
yum install -y certbot
2.3、证书申请
hlvy.com是域名 比如www.baidu.com 需要填写baidu.com就好了 可以匹配任意xxx.baidu.com
certbot certonly -d *.hlvy.com --manual
–preferred-challenges dns
–server https://acme-v02.api.letsencrypt.org/directory
-
–manual交互式获取，
-
–preferred-challenges dns使用DNS验证的方式（泛域名只能使用DNS验证），如果取消此选项，将会默认使用 http 形式认证(.well-known)，
-
–server指明支持acme-v02的Server地址，默认是acme-v01的地址。
申请过程如下，为了确保域名是
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在你的管理权限之内，我们中间需要做一条 TXT 的 DNS 解析。
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter ‘c’ to
cancel): wangzan18@126.com
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
(A)gree/©ancel: A
Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let’s Encrypt project and the non-profit
organization that develops Certbot? We’d like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.
(Y)es/(N)o: N
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for wzlinux.com
NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you’re running certbot in manual mode on a machine that is not
your server, please ensure you’re okay with that.
Are you OK with your IP being logged?
(Y)es/(N)o: Y
Please deploy a DNS TXT record under the name
_acme-challenge.wzlinux.com with the following value:
EFC5zDV4Yyz1DY6796qHlUCS-TBWQCuxj3Re_-kTiiI
Before continuing, verify the record is deployed.
Press Enter to Continue
Waiting for verification…
Cleaning up challenges
Resetting dropped connection: acme-v02.api.letsencrypt.org
importANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/hlvy.com/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/hlvy.com/privkey.pem
Your cert will expire on 2019-09-04. To obtain a new or tweaked
version of this certificate in the future, simply run certbot
again. To non-interactively renew all of your certificates, run
“certbot renew”
- Your account credentials have been saved in your Certbot
configuration directory at /etc/letsencrypt. You should make a
secure backup of this folder now. This configuration directory will
also contain certificates and private keys obtained by Certbot so
making regular backups of this folder is ideal.
- If you like Certbot, please consider supporting our work by:
Donating to ISRG / Let’s Encrypt: https://letsencrypt.org/donate
Donating to EFF: https://eff.org/donate-le
我们看到上面有一条 DNS 解析需求，我这里是在阿里云进行设定的。 在执行到Press Enter to Continue先别敲回车
先在阿里云配置域名
EFC5zDV4Yyz1DY6796qHlUCS-TBWQCuxj3Re_-kTiiI 这个是解析路径 是复制上面生成出来的
解析好之后，我们在服务器上面验证一下解析记录。
[root@ip-172-26-5-120 ~]# dig -t txt _acme-challenge.hlvy.com
; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> -t txt _acme-challenge.hlvy.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47252
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;_acme-challenge.hlvy.com.INTXT
;; ANSWER SECTION:
acme-challenge.hlvy.com. 58INTXT"EFC5zDV4Yyz1DY6796qHlUCS-TBWQCuxj3Re-kTiiI"
;; Query time: 0 msec
;; SERVER: 172.26.0.2#53(172.26.0.2)
;; WHEN: Thu Jun 06 07:04:07 UTC 2019
;; MSG SIZE rcvd: 112
2.4、证书查看
[root@ip-172-26-5-120 ~]# ll /etc/letsencrypt/live/hlvy.com/
total 4
lrwxrwxrwx. 1 root root 35 Jun 6 06:53 cert.pem -> …/…/archive/hlvy.com/cert1.pem
lrwxrwxrwx. 1 root root 36 Jun 6 06:53 chain.pem -> …/…/archive/hlvy.com/chain1.pem
lrwxrwxrwx. 1 root root 40 Jun 6 06:53 fullchain.pem -> …/…/archive/hlvy.com/fullchain1.pem
lrwxrwxrwx. 1 root root 38 Jun 6 06:53 privkey.pem -> …/…/archive/hlvy.com/privkey1.pem
-rw-r–r--. 1 root root 692 Jun 6 06:53 README
Tomcat7配置Let’s Encrypt免费SSL证书
从上图（证书获取成功的提示信息）可以看出，获取到的 Let’s Encrypt 证书保存在 /etc/letsencrypt/live/hlvy.com/ 目录下，相关的证书文件有4个：
cert.pem
chain.pem
fullchain.pem
privkey.pem
我们需要用到的是后面两个证书文件： fullchain.pem 和 privkey.pem。接下来，还需要用到 Linux 下的 openssl 和 keytool 工具，将SSL证书由 .pem 格式转换成 Tomcat 所支持的 .jks 格式。
导出.p12格式的证书$ openssl pkcs12 -export -in fullchain.pem -inkey privkey.pem -out hlvy_letsencrypt.p12 -name tomcat_letsencrypt
再将证书由.p12格式转换成.jks格式$ keytool -importkeystore -deststorepass ‘123456’ -destkeypass ‘123456’ -destkeystore hlvy_letsencrypt.jks -srckeystore zyxx_letsencrypt.p12 -srcstoretype PKCS12 -srcstorepass ‘123456’ -alias tomcat_letsencrypt
