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call mtr.add_suppression("santa.claus.ipv4.example.com");
flush status;
TRUNCATE TABLE performance_schema.host_cache;
flush user_resources;
flush privileges;
select @@global.debug;
@@global.debug
select @@global.max_connect_errors;
@@global.max_connect_errors
100
select @@global.max_user_connections;
@@global.max_user_connections
0
select @@global.max_connections;
@@global.max_connections
151
select `User`, `Host` from mysql.`user` where `host` like '%\\%%';
User Host
select `User`, `Host` from mysql.`user` where `user` like '192.%';
User Host
select `User`, `Host` from mysql.`user` where `user` like '2001:%';
User Host
select `User`, `Host` from mysql.`user` where `user` like 'santa.claus.%';
User Host
create user 'root'@'santa.claus.ipv4.example.com', 'root'@'192.0.2.4';
grant select on test.* to 'root'@'santa.claus.ipv4.example.com';
grant select on test.* to 'root'@'192.0.2.4';
select "Con1 is alive";
Con1 is alive
Con1 is alive
select current_user();
current_user()
root@localhost
set global debug= "+d,vio_peer_addr_fake_ipv4,getnameinfo_fake_ipv4,getaddrinfo_error_noname";
select "Con2 is alive";
Con2 is alive
Con2 is alive
select current_user();
current_user()
root@192.0.2.4
"Dumping performance_schema.host_cache"
IP 192.0.2.4
HOST NULL
HOST_VALIDATED YES
SUM_CONNECT_ERRORS 0
COUNT_HOST_BLOCKED_ERRORS 0
COUNT_NAMEINFO_TRANSIENT_ERRORS 0
COUNT_NAMEINFO_PERMANENT_ERRORS 0
COUNT_FORMAT_ERRORS 0
COUNT_ADDRINFO_TRANSIENT_ERRORS 0
COUNT_ADDRINFO_PERMANENT_ERRORS 1
COUNT_FCRDNS_ERRORS 0
COUNT_HOST_ACL_ERRORS 0
COUNT_NO_AUTH_PLUGIN_ERRORS 0
COUNT_AUTH_PLUGIN_ERRORS 0
COUNT_HANDSHAKE_ERRORS 0
COUNT_PROXY_USER_ERRORS 0
COUNT_PROXY_USER_ACL_ERRORS 0
COUNT_AUTHENTICATION_ERRORS 0
COUNT_SSL_ERRORS 0
COUNT_MAX_USER_CONNECTIONS_ERRORS 0
COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS 0
COUNT_DEFAULT_DATABASE_ERRORS 0
COUNT_INIT_CONNECT_ERRORS 0
COUNT_LOCAL_ERRORS 0
COUNT_UNKNOWN_ERRORS 0
FIRST_ERROR_SEEN set
LAST_ERROR_SEEN set
select "Con3 is alive";
Con3 is alive
Con3 is alive
select current_user();
current_user()
root@192.0.2.4
"Dumping performance_schema.host_cache"
IP 192.0.2.4
HOST NULL
HOST_VALIDATED YES
SUM_CONNECT_ERRORS 0
COUNT_HOST_BLOCKED_ERRORS 0
COUNT_NAMEINFO_TRANSIENT_ERRORS 0
COUNT_NAMEINFO_PERMANENT_ERRORS 0
COUNT_FORMAT_ERRORS 0
COUNT_ADDRINFO_TRANSIENT_ERRORS 0
COUNT_ADDRINFO_PERMANENT_ERRORS 1
COUNT_FCRDNS_ERRORS 0
COUNT_HOST_ACL_ERRORS 0
COUNT_NO_AUTH_PLUGIN_ERRORS 0
COUNT_AUTH_PLUGIN_ERRORS 0
COUNT_HANDSHAKE_ERRORS 0
COUNT_PROXY_USER_ERRORS 0
COUNT_PROXY_USER_ACL_ERRORS 0
COUNT_AUTHENTICATION_ERRORS 0
COUNT_SSL_ERRORS 0
COUNT_MAX_USER_CONNECTIONS_ERRORS 0
COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS 0
COUNT_DEFAULT_DATABASE_ERRORS 0
COUNT_INIT_CONNECT_ERRORS 0
COUNT_LOCAL_ERRORS 0
COUNT_UNKNOWN_ERRORS 0
FIRST_ERROR_SEEN set
LAST_ERROR_SEEN set
revoke select on test.* from 'root'@'santa.claus.ipv4.example.com';
revoke select on test.* from 'root'@'192.0.2.4';
drop user 'root'@'santa.claus.ipv4.example.com';
drop user 'root'@'192.0.2.4';
set global debug= default;
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