谢谢各位老师，正确配置如下：
[lightning]
level = "info"
file = "tidb-lightning.log"
[tikv-importer]
backend = "local"
sorted-kv-dir = "/data/lightning_data/"
[mydumper]
data-source-dir = "/tmp/test/"
filter = ['*.*', '!mysql.*', '!sys.*', '!INFORMATION_SCHEMA.*', '!PERFORMANCE_SCHEMA.*', '!METRICS_SCHEMA.*', '!INSPECTION_SCHEMA.*']
[tidb]
host = "192.168.237.141"
port = 4000
user = "root"
password = ""
status-port = 10080
pd-addr = "192.168.237.141:2379"
tls = "preferred"
[security]
ca-path = "/data/tidb-deploy/pd-2379/tls/ca.crt"
cert-path = "/data/tidb-deploy/pd-2379/tls/pd.crt"
key-path = "/data/tidb-deploy/pd-2379/tls/pd.pem"
[tidb.security]
cert-path = "/data/certs/server-cert.pem"
key-path = "/data/certs/server-key.pem"