リモートmysqlサーバーに接続しようとしています。これは、100%の時間で発生します。
クライアント:Win32(AMD64)向けmysql Ver 14.14 Distrib 5.7.12
サーバーの:5.0.95
これは私が得るエラーです:
C:\>mysql -h example.com -P 3306 -D prod_rcadb -u username -p
Enter password: **********
ERROR 2027 (HY000): Malformed packet
mysqladminと同じエラー:
C:\>mysqladmin -h example.com -P 3306 -u username -p version
Enter password: **********
mysqladmin: connect to server at '10.106.24.79' failed
error: 'Malformed packet'
それで、その会話がどのように見えるかを知るために、私はpcapを取りました。
TCPハンドシェイク:
1 2016-04-14 11:18:48.910690 0.000000 137.69.150.80 10.106.24.79 TCP 66 51157→3306 [SYN] Seq=0 Win=8192 Len=0 MSS=1428 WS=256 SACK_PERM=1 8192
2 2016-04-14 11:18:49.019893 0.109203 10.106.24.79 137.69.150.80 TCP 66 3306→51157 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460 SACK_PERM=1 WS=256 5840
3 2016-04-14 11:18:49.019893 0.000000 137.69.150.80 10.106.24.79 TCP 54 51157→3306 [ACK] Seq=1 Ack=1 Win=65536 Len=0 256
MySQL接続ネゴシエーション:
4 2016-04-14 11:18:49.144696 0.124803 10.106.24.79 137.69.150.80 MySQL 110 Server Greeting proto=10 version=5.0.95 23
5 2016-04-14 11:18:49.144696 0.000000 137.69.150.80 10.106.24.79 MySQL 119 Login Request user=bigdata 256<br>
6 2016-04-14 11:18:49.144696 0.000000 10.106.24.79 137.69.150.80 TCP 60 3306→51157 [ACK] Seq=57 Ack=66 Win=5888 Len=0 23
7 2016-04-14 11:18:49.316301 0.171605 10.106.24.79 137.69.150.80 MySQL 60 Response 23
したがって、クライアントはTCPレベルで接続し、サーバーはサポートされているオプションとステータスで挨拶します。
Server Capabilities: 0xa22c
.... .... .... ...0 = Long Password: Not set
.... .... .... ..0. = Found Rows: Not set
.... .... .... .1.. = Long Column Flags: Set
.... .... .... 1... = Connect With Database: Set
.... .... ...0 .... = Don't Allow database.table.column: Not set
.... .... ..1. .... = Can use compression protocol: Set
.... .... .0.. .... = ODBC Client: Not set
.... .... 0... .... = Can Use LOAD DATA LOCAL: Not set
.... ...0 .... .... = Ignore Spaces before '(': Not set
.... ..1. .... .... = Speaks 4.1 protocol (new flag): Set
.... .0.. .... .... = Interactive Client: Not set
.... 0... .... .... = Switch to SSL after handshake: Not set
...0 .... .... .... = Ignore sigpipes: Not set
..1. .... .... .... = Knows about transactions: Set
.0.. .... .... .... = Speaks 4.1 protocol (old flag): Not set
1... .... .... .... = Can do 4.1 authentication: Set
Server Language: latin1 COLLATE latin1_swedish_ci (8)
クライアントはログインを要求します:
.... .... .... ...1 = Long Password: Set
.... .... .... ..0. = Found Rows: Not set
.... .... .... .1.. = Long Column Flags: Set
.... .... .... 0... = Connect With Database: Not set
.... .... ...0 .... = Don't Allow database.table.column: Not set
.... .... ..0. .... = Can use compression protocol: Not set
.... .... .0.. .... = ODBC Client: Not set
.... .... 1... .... = Can Use LOAD DATA LOCAL: Set
.... ...0 .... .... = Ignore Spaces before '(': Not set
.... ..1. .... .... = Speaks 4.1 protocol (new flag): Set
.... .0.. .... .... = Interactive Client: Not set
.... 0... .... .... = Switch to SSL after handshake: Not set
...0 .... .... .... = Ignore sigpipes: Not set
..1. .... .... .... = Knows about transactions: Set
.0.. .... .... .... = Speaks 4.1 protocol (old flag): Not set
1... .... .... .... = Can do 4.1 authentication: Set
Extended Client Capabilities: 0x81be
.... .... .... ...0 = Multiple statements: Not set
.... .... .... ..1. = Multiple results: Set
.... .... .... .1.. = PS Multiple results: Set
.... .... .... 1... = Plugin Auth: Set
.... .... ...1 .... = Connect attrs: Set
.... .... ..1. .... = Plugin Auth LENENC Client Data: Set
.... .... 1... .... = Session variable tracking: Set
1000 0001 .0.. .... = Unused: 0x0204
サーバーは確認し、本質的に空の応答を送信します…
Packet Length: 1
Packet Number: 2
EOF marker: 254
そして、すぐにクライアントがFINを見つけてソケットを閉じます:
8 2016-04-14 11:18:49.316301 0.000000 137.69.150.80 10.106.24.79 TCP 54 51157→3306 [FIN, ACK] Seq=66 Ack=62 Win=65536 Len=0 256
9 2016-04-14 11:18:49.332901 0.016600 10.106.24.79 137.69.150.80 TCP 60 3306→51157 [ACK] Seq=62 Ack=67 Win=5888 Len=0 23
10 2016-04-14 11:18:49.391904 0.059003 10.106.24.79 137.69.150.80 TCP 60 3306→51157 [FIN, ACK] Seq=62 Ack=67 Win=5888 Len=0 23
11 2016-04-14 11:18:49.391904 0.000000 137.69.150.80 10.106.24.79 TCP 54 51157→3306 [ACK] Seq=67 Ack=63 Win=65536 Len=0 256
そのため、接続クライアントは、サーバーが送信した空のパケットを好まなかった。
同じクライアントから同じバージョンの別のmysqlサーバーに対してこれを取得しません。サーバー2からのログイン要求に対する応答パケットは次のとおりです。
Packet Length: 7
Packet Number: 2
Affected Rows: 0
Server Status: 0x0002
.... .... .... ...0 = In transaction: Not set
.... .... .... ..1. = AUTO_COMMIT: Set
.... .... .... .0.. = More results: Not set
.... .... .... 0... = Multi query - more resultsets: Not set
.... .... ...0 .... = Bad index used: Not set
.... .... ..0. .... = No index used: Not set
.... .... .0.. .... = Cursor exists: Not set
.... .... 0... .... = Last row sent: Not set
.... ...0 .... .... = database dropped: Not set
.... ..0. .... .... = No backslash escapes: Not set
.... .0.. .... .... = Session state changed: Not set
.... 0... .... .... = Query was slow: Not set
...0 .... .... .... = PS Out Params: Not set
私はこのdbを自分で管理していませんが、ログで検索するものについて提案があれば、その情報を要求できます。
サーバーから空のパケットが返される理由についての考えはありますか?