报错情况：

keytool -list -keystore /usr/local/java/jdk1.8.0_161/jre/lib/security/cacerts/  -alias yncanginx -v

keytool -import -alias yncanginx -keystore cacerts -file /usr/local/java/jdk1.8.0_161/jre/lib/security/yncacert/yncanginx.cer