每当我在我的服务器上运行sudo apache2 -S时，它会抛出以下错误：
[Sun Mar 04 16:17:22.303217 2018] [core:warn] [pid 31405] AH00111: Config variable ${APACHE_LOCK_DIR} is not defined
[Sun Mar 04 16:17:22.303414 2018] [core:warn] [pid 31405] AH00111: Config variable ${APACHE_PID_FILE} is not defined
[Sun Mar 04 16:17:22.303503 2018] [core:warn] [pid 31405] AH00111: Config variable ${APACHE_RUN_USER} is not defined
[Sun Mar 04 16:17:22.303577 2018] [core:warn] [pid 31405] AH00111: Config variable ${APACHE_RUN_GROUP} is not defined
[Sun Mar 04 16:17:22.303655 2018] [core:warn] [pid 31405] AH00111: Config variable ${APACHE_LOG_DIR} is not defined
[Sun Mar 04 16:17:22.306324 2018] [core:warn] [pid 31405:tid 140656836052864] AH00111: Config variable ${APACHE_LOG_DIR} is not defined
AH00526: Syntax error on line 74 of /etc/apache2/apache2.conf:
Invalid Mutex directory in argument file:${APACHE_LOCK_DIR}
我已经尝试了几件事，但它一直给我这些错误...我对apache2.conf做了一些调整但最终没有工作所以我恢复了我的更改，尝试下载默认的ennvardid不工作
我的/etc/apache2/apache2.conf文件看起来像这样：
# This is the main Apache server configuration file. It contains the
# configuration directives that give the server its instructions.
# See http://httpd.apache.org/docs/2.4/ for detailed information about
# the directives and /usr/share/doc/apache2/README.Debian about Debian specific
# hints.
#
#
# Summary of how the Apache 2 configuration works in Debian:
# The Apache 2 web server configuration in Debian is quite different to
# upstream's suggested way to configure the web server. This is because Debian's
# default Apache2 installation attempts to make adding and removing modules,
# virtual hosts, and extra configuration directives as flexible as possible, in
# order to make automating the changes and administering the server as easy as
# possible.
# It is split into several files forming the configuration hierarchy outlined
# below, all located in the /etc/apache2/ directory:
#
# /etc/apache2/
# |-- apache2.conf
# | `-- ports.conf
# |-- mods-enabled
# | |-- *.load
# | `-- *.conf
# |-- conf-enabled
# | `-- *.conf
# `-- sites-enabled
# `-- *.conf
#
#
# * apache2.conf is the main configuration file (this file). It puts the pieces
# together by including all remaining configuration files when starting up the
# web server.
#
# * ports.conf is always included from the main configuration file. It is
# supposed to determine listening ports for incoming connections which can be
# customized anytime.
#
# * Configuration files in the mods-enabled/, conf-enabled/ and sites-enabled/
# directories contain particular configuration snippets which manage modules,
# global configuration fragments, or virtual host configurations,
# respectively.
#
# They are activated by symlinking available configuration files from their
# respective *-available/ counterparts. These should be managed by using our
# helpers a2enmod/a2dismod, a2ensite/a2dissite and a2enconf/a2disconf. See
# their respective man pages for detailed information.
#
# * The binary is called apache2. Due to the use of environment variables, in
# the default configuration, apache2 needs to be started/stopped with
# /etc/init.d/apache2 or apache2ctl. Calling /usr/bin/apache2 directly will not
# work with the default configuration.
# Global configuration
#
#
# ServerRoot: The top of the directory tree under which the server's
# configuration, error, and log files are kept.
#
# NOTE! If you intend to place this on an NFS (or otherwise network)
# mounted filesystem then please read the Mutex documentation (available
# at <URL:http://httpd.apache.org/docs/2.4/mod/core.html#mutex>);
# you will save yourself a lot of trouble.
#
# Do NOT add a slash at the end of the directory path.
#
ServerRoot "/etc/apache2"
#
# The accept serialization lock file MUST BE STORED ON A LOCAL DISK.
#
Mutex file:${APACHE_LOCK_DIR} default
#
# PidFile: The file in which the server should record its process
# identification number when it starts.
# This needs to be set in /etc/apache2/envvars
#
PidFile ${APACHE_PID_FILE}
#
# Timeout: The number of seconds before receives and sends time out.
#
Timeout 300
#
# KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
#
KeepAlive On
#
# MaxKeepAliveRequests: The maximum number of requests to allow
# during a persistent connection. Set to 0 to allow an unlimited amount.
# We recommend you leave this number high, for maximum performance.
#
MaxKeepAliveRequests 100
#
# KeepAliveTimeout: Number of seconds to wait for the next request from the
# same client on the same connection.
#
KeepAliveTimeout 5
# These need to be set in /etc/apache2/envvars
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
#
# HostnameLookups: Log the names of clients or just their IP addresses
# e.g., www.apache.org (on) or 204.62.129.132 (off).
# The default is off because it'd be overall better for the net if people
# had to knowingly turn this feature on, since enabling it means that
# each client request will result in AT LEAST one lookup request to the
# nameserver.
#
HostnameLookups Off
# ErrorLog: The location of the error log file.
# If you do not specify an ErrorLog directive within a <VirtualHost>
# container, error messages relating to that virtual host will be
# logged here. If you *do* define an error logfile for a <VirtualHost>
# container, that host's errors will be logged there and not here.
#
ErrorLog ${APACHE_LOG_DIR}/error.log
#
# LogLevel: Control the severity of messages logged to the error_log.
# Available values: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the log level for particular modules, e.g.
# "LogLevel info ssl:warn"
#
LogLevel warn
# Include module configuration:
IncludeOptional mods-enabled/*.load
IncludeOptional mods-enabled/*.conf
# Include list of ports to listen on
Include ports.conf
# Sets the default security model of the Apache2 HTTPD server. It does
# not allow access to the root filesystem outside of /usr/share and /var/www.
# The former is used by web applications packaged in Debian,
# the latter may be used for local directories served by the web server. If
# your system is serving content from a sub-directory in /srv you must allow
# access here, or in any related virtual host.
<Directory />
Options FollowSymLinks
AllowOverride None
Require all denied
</Directory>
<Directory /usr/share>
AllowOverride None
Require all granted
</Directory>
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
#<Directory /srv/>
# Options Indexes FollowSymLinks
# AllowOverride None
# Require all granted
IncludeOptional sites-enabled/*.conf
#</Directory>
# AccessFileName: The name of the file to look for in each directory
# for additional configuration directives. See also the AllowOverride
# directive.
#
AccessFileName .htaccess
#
# The following lines prevent .htaccess and .htpasswd files from being
# viewed by Web clients.
#
<FilesMatch "^\.ht">
Require all denied
</FilesMatch>
#
# The following directives define some format nicknames for use with
# a CustomLog directive.
#
# These deviate from the Common Log Format definitions in that they use %O
# (the actual bytes sent including headers) instead of %b (the size of the
# requested file), because the latter makes it impossible to detect partial
# requests.
#
# Note that the use of %{X-Forwarded-For}i instead of %h is not recommended.
# Use mod_remoteip instead.
#
LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
# Include of directories ignores editors' and dpkg's backup files,
# see README.Debian for details.
# Include generic snippets of statements
IncludeOptional conf-enabled/*.conf
# Include the virtual host configurations:
IncludeOptional sites-enabled/*.conf
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
可能是什么问题，我错过了什么？
这篇文章是这篇文章的延续：Virtualhost Apache on Ubuntu server not working
编辑
我将export APACHE_LOCK_DIR=/var/lock/apache2$SUFFIX，export APACHE_RUN_USER=www-data和export APACHE_RUN_GROUP=www-data添加到envvars并运行这些命令sudo service apache2 restart和# sudo apachectl -k start -S。这给了我以下输出：
root@vps520749:~# sudo apachectl -k start -S
VirtualHost configuration:
*:80 vps520749.ovh.net (/etc/apache2/sites-enabled/000-default.conf:1)
ServerRoot: "/etc/apache2"
Main DocumentRoot: "/var/www/html"
Main ErrorLog: "/var/log/apache2/error.log"
Mutex default: dir="/var/run/apache2/" mechanism=default
Mutex watchdog-callback: using_defaults
PidFile: "/var/run/apache2/apache2.pid"
Define: DUMP_VHOSTS
Define: DUMP_RUN_CFG
User: name="www-data" id=33
Group: name="www-data" id=33
现在，一旦我运行sudo apache2 -S，这是我的输出：
[Tue Mar 06 00:46:48.762674 2018] [core:warn] [pid 11162] AH00111: Config variab le ${APACHE_PID_FILE} is not defined
[Tue Mar 06 00:46:48.762883 2018] [core:warn] [pid 11162] AH00111: Config variab le ${APACHE_RUN_USER} is not defined
[Tue Mar 06 00:46:48.762967 2018] [core:warn] [pid 11162] AH00111: Config variab le ${APACHE_RUN_GROUP} is not defined
[Tue Mar 06 00:46:48.763091 2018] [core:warn] [pid 11162] AH00111: Config variab le ${APACHE_LOG_DIR} is not defined
[Tue Mar 06 00:46:48.765580 2018] [core:warn] [pid 11162:tid 139874816681856] AH 00111: Config variable ${APACHE_LOG_DIR} is not defined
[Tue Mar 06 00:46:48.765970 2018] [core:warn] [pid 11162:tid 139874816681856] AH 00111: Config variable ${APACHE_LOG_DIR} is not defined
[Tue Mar 06 00:46:48.766049 2018] [core:warn] [pid 11162:tid 139874816681856] AH 00111: Config variable ${APACHE_LOG_DIR} is not defined
AH00543: apache2: bad user name ${APACHE_RUN_USER}
这些消息是可以预期的。当直接调用Apache二进制文件时，它会忽略/etc/apache2/envvars文件的内容。如果通过init文件或apachectl启动Apache，则不会发生这种情况。确保定义了变量：
# grep lock /etc/apache2/envvars
export APACHE_LOCK_DIR=/var/lock/apache2$SUFFIX
并使用：
# sudo apachectl -k start -S