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首先，停止與該操作系統啓動時，如果在終端選項卡我運行sudo mysqld（它會立即退出）MySQL服務器實例後，sudo service mysql status在另一個選項卡中的輸出是這樣的：如何在Ubuntu 17.04上更改mysql-server中的root @ localhost密碼？
[email protected]:~$ sudo service mysql status
[sudo] password for silviu:
● mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Thu 2017-09-28 00:33:25 EEST; 10h ago
Main PID: 6157 (code=exited, status=0/SUCCESS)
sep 28 00:33:03 silviu-Inspiron-3537 systemd[1]: Starting MySQL Community Server...
sep 28 00:33:04 silviu-Inspiron-3537 systemd[1]: Started MySQL Community Server.
sep 28 00:33:23 silviu-Inspiron-3537 systemd[1]: Stopping MySQL Community Server...
sep 28 00:33:25 silviu-Inspiron-3537 systemd[1]: Stopped MySQL Community Server.
我刪除/var/log/syslog並在完成上述步驟後，此日誌文件不會重新創建新內容。在/var/log/mysql/error.log上面的命令沒有附加新行。
如果我運行sudo service mysql start代替sudo mysqld，命令sudo service mysql status的輸出是不同的：
[email protected]:~$ sudo service mysql status
● mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2017-09-28 11:19:24 EEST; 7s ago
Process: 16133 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)
Process: 16124 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
Main PID: 16132 (mysqld)
Tasks: 28 (limit: 4915)
CGroup: /system.slice/mysql.service
└─16132 /usr/sbin/mysqld
sep 28 11:19:23 silviu-Inspiron-3537 systemd[1]: Starting MySQL Community Server...
sep 28 11:19:24 silviu-Inspiron-3537 systemd[1]: Started MySQL Community Server.
但我想，因爲它the official documentation一節「B.5.3說手動運行sudo mysqld命令。 2.2重置root密碼：Unix和類Unix系統中」我可以通過它的參數--init-file這樣的：
sudo mysqld --init-file=/home/silviu/Desktop/chpass.sql
更改根MySQL服務器的@localhost密碼。的chpass.sql目前的內容是：
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('root');
ALTER USER 'root'@'localhost' IDENTIFIED BY 'root';
UPDATE mysql.user
SET authentication_string = PASSWORD('root'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
FLUSH PRIVILEGES;
我在這個文件編譯所有三個SQL方法更改爲the official documentation link given above解釋root用戶「根」的密碼。
我使用5.7.19-0ubuntu0.17.04.1版官方mysql-server包：
[email protected]:~$ sudo apt-cache policy mysql-server
mysql-server:
Instalat: 5.7.19-0ubuntu0.17.04.1
Candidează: 5.7.19-0ubuntu0.17.04.1
Tabela de versiuni:
*** 5.7.19-0ubuntu0.17.04.1 500
500 http://ro.archive.ubuntu.com/ubuntu zesty-updates/main amd64 Packages
500 http://ro.archive.ubuntu.com/ubuntu zesty-updates/main i386 Packages
500 http://security.ubuntu.com/ubuntu zesty-security/main amd64 Packages
500 http://security.ubuntu.com/ubuntu zesty-security/main i386 Packages
100 /var/lib/dpkg/status
5.7.17-0ubuntu1 500
500 http://ro.archive.ubuntu.com/ubuntu zesty/main amd64 Packages
500 http://ro.archive.ubuntu.com/ubuntu zesty/main i386 Packages
有了這個sudo mysqld錯誤，標題中的問題是：我怎麼能在MySQL服務器更改root @本地密碼在Ubuntu 17.04 ？
更新：我用一個新的細節改變了第一段。
更新2：當服務器停止，這是另一種行爲（日期和時間更早從今天開始，而不是從當前時刻）：
[email protected]:~$ sudo mysqld_safe --skip-grant-tables
2017-09-28T09:39:41.881058Z mysqld_safe Logging to syslog.
2017-09-28T09:39:41.883753Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2017-09-28T09:39:41.886446Z mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists.
更新3：a relevant related question on AskUbuntu。
更新4：在/var/log/syslog，我發現這幾行：
Sep 28 12:58:09 silviu-Inspiron-3537 kernel: [ 4571.559077] audit: type=1400 audit(1506592689.673:93): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/8532/status" pid=8532 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Sep 28 12:58:09 silviu-Inspiron-3537 kernel: [ 4571.559079] audit: type=1400 audit(1506592689.673:94): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/sys/devices/system/node/" pid=8532 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Sep 28 12:58:09 silviu-Inspiron-3537 kernel: [ 4571.559148] audit: type=1400 audit(1506592689.673:95): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/proc/8532/status" pid=8532 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
在/etc/apparmor.d/usr.sbin.mysqld我嘗試添加這些行：
/proc/** rwk
/sys/devices/system/** rwk
但出現同樣的錯誤，即使我禁用AppArmor的用然後再運行sudo mysqld：
[email protected]:~$ sudo /etc/init.d/apparmor stop
[sudo] password for silviu:
[ ok ] Stopping apparmor (via systemctl): apparmor.service.