redis连接时报错：Could not connect to Redis at 192.168.1.21:6379: Connection refused

[root@admin2 bin]# redis-cli -h 192.168.1.21 info Replication
Could not connect to Redis at 192.168.1.21:6379: Connection refused

[root@admin2 bin]# redis-cli -h 127.0.0.1 info Replication
# Replication
role:slave
master_host:192.168.1.21
master_port:6379
master_link_status:down
master_last_io_seconds_ago:-1
master_sync_in_progress:0
slave_repl_offset:1
master_link_down_since_seconds:1536458613
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:d426c9f4ca894232a5264edcca622dd9c7628adf
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
[root@admin2 bin]#