启动报错：
plugin 'metadata_cache' failed to load: /usr/lib64/mysqlrouter/metadata_cache.so: symbol X509_check_ip_asc, version libcrypto.so.10 not defined in file libcrypto.so.10 with link time reference
Error: /usr/lib64/mysqlrouter/metadata_cache.so: symbol X509_check_ip_asc, version libcrypto.so.10 not defined in file libcrypto.so.10 with link time reference
解决办法：
升级openssl
yum install openssl
或者
yum update openssl
更新完毕:
openssl.x86_64 1:1.0.2k-19.el7
作为依赖被升级:
openssl-devel.x86_64 1:1.0.2k-19.el7
openssl-libs.x86_64 1:1.0.2k-19.el7