$ sudo chkconfig --add elasticsearch $ sudo systemctl daemon-reload $ sudo systemctl enable elasticsearch.service $ sudo systemctl restart elasticsearch.service
④Graylog安装$ sudo rpm -Uvh https://packages.graylog2.org/repo/packages/graylog-2.3-repository_latest.rpm $ sudo yum install graylog-server
编辑graylog配置文件 /etc/graylog/server/server.conf，添加 password_secret和 password_secret_sha2(必须)
可以使用 echo -n yourpassword | sha256sum 命令来生成 password_secret_sha2。
设置rest_listen_uri以及web_listen_uri为公共ip或公共hostname，以便连接graylog。
# cat /etc/graylog/server/server.conf
############################
# GRAYLOG CONFIGURATION FILE
############################
#
# This is the Graylog configuration file. The file has to use ISO 8859-1/Latin-1 character encoding.
# Characters that cannot be directly represented in this encoding can be written using Unicode escapes
# as defined in https://docs.Oracle.com/javase/specs/jls/se8/html/jls-3.html#jls-3.3, using the \u prefix.
# For example, \u002c.
#
# * Entries are generally expected to be a single line of the form, one of the following:
#
# propertyName=propertyValue
# propertyName:propertyValue
#
# * White space that appears between the property name and property value is ignored,
# so the following are equivalent:
#
# name=Stephen
# name = Stephen
#
# * White space at the beginning of the line is also ignored.
#
# * Lines that start with the comment characters ! or # are ignored. Blank lines are also ignored.
#
# * The property value is generally terminated by the end of the line. White space following the
# property value is not ignored, and is treated as part of the property value.
#
# * A property value can span several lines if each line is terminated by a backslash (鈥榎鈥 character.
# For example:
#
# targetCities=\
# Detroit,\
# Chicago,\
# Los Angeles
#
# This is equivalent to targetCities=Detroit,Chicago,Los Angeles (white space at the beginning of lines is ignored).
#
# * The characters newline, carriage return, and tab can be inserted with characters \n, \r, and \t, respectively.
#
# * The backslash character must be escaped as a double backslash. For example:
#
# path=c:\\docs\\doc1
#