[LINUX] What to do if the yum command fails to set locale, defaulting to C

--Environment --Container created with Docker - CentOS Linux release 7.7.1908 (Core) - CUI : Xfce - xfce4-terminal 0.8.7.4

Event: I was told something after yum check

$ sudo yum check
Failed to set locale, defaulting to C
Loaded plugins: fastestmirror, ovl
check all

Cause: LC_ALL is not set

"Failed to set locale, defaulting to C" is displayed when yum is executed. --IT classroom where Tihiro's head can rest

#LC when checking environment variables_There is no ALL
$ printenv | grep LC 
$

Action: Set LC_ALL

#Set
$ export LC_ALL=C
#check
$ printenv | grep LC
LC_ALL=C
#Try again
$ sudo yum check
Loaded plugins: fastestmirror, ovl
check all

Cause: There is no locale set in the configurable locale

Failed to set locale, defaulting to C is displayed when executing a command on RHEL8 --Qiita

Status 1: The locale is set to "ja_JP.UTF-8"

# 「ja_JP.UTF-Even if "8" is set ...
$ localectl
   System Locale: LANG=ja_JP.UTF-8
       VC Keymap: us
      X11 Layout: us

# 「ja_JP.UTF-It is said that there is no 8 "
$ locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=ja_JP.UTF-8
LC_CTYPE="ja_JP.UTF-8"
LC_NUMERIC="ja_JP.UTF-8"
LC_TIME="ja_JP.UTF-8"
LC_COLLATE="ja_JP.UTF-8"
LC_MONETARY="ja_JP.UTF-8"
LC_MESSAGES="ja_JP.UTF-8"
LC_PAPER="ja_JP.UTF-8"
LC_NAME="ja_JP.UTF-8"
LC_ADDRESS="ja_JP.UTF-8"
LC_TELEPHONE="ja_JP.UTF-8"
LC_MEASUREMENT="ja_JP.UTF-8"
LC_IDENTIFICATION="ja_JP.UTF-8"
LC_ALL=

State 2: There is no "ja_JP.UTF-8" in the configurable locale

#"Ja" in the configurable locale_JP.UTF-8 "is not
$ localectl list-locales
en_US.utf8

$ locale -a
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_COLLATE to default locale: No such file or directory
C
POSIX
en_US.utf8

#Not even in the installable language package ...
$ sudo yum list langpacks-*
Failed to set locale, defaulting to C
Loaded plugins: fastestmirror, ovl
Repository google-chrome is listed more than once in the configuration
Loading mirror speeds from cached hostfile
 * base: ty1.mirror.newmediaexpress.com
 * epel: nrt.edge.kernel.org
 * extras: ty1.mirror.newmediaexpress.com
 * updates: ty1.mirror.newmediaexpress.com
Error: No matching Packages to list

Information: CentOS7 made with Docker does not have a Japanese locale, and even if it is set, it seems to disappear when yum update is done.

I added Japanese with localedef in the Docker definition file, but for some reason there is no Japanese locale. The answer was on the following page.

Docker's centos: centos7 has zero locale -a | grep -c ja_JP, which means that the Japanese locale is not defined. ... omitted ... If you yum update glibc-common, it will disappear w Add an indelible Japanese locale to the CentOS 7 container-Qiita

Correspondence: Add Japanese locale

Kill the cannot change locale --ARCHIVESDRIVE HB

# 「ja_JP.UTF-8 "is added
$ sudo localedef -f UTF-8 -i ja_JP ja_JP

#added!
$ localectl list-locales
en_US.utf8
ja_JP
ja_JP.utf8
$ locale -a
C
POSIX
en_US.utf8
ja_JP
ja_JP.utf8

#The error message has disappeared!
$ locale
LANG=ja_JP.UTF-8
LC_CTYPE="ja_JP.UTF-8"
LC_NUMERIC="ja_JP.UTF-8"
LC_TIME="ja_JP.UTF-8"
LC_COLLATE="ja_JP.UTF-8"
LC_MONETARY="ja_JP.UTF-8"
LC_MESSAGES="ja_JP.UTF-8"
LC_PAPER="ja_JP.UTF-8"
LC_NAME="ja_JP.UTF-8"
LC_ADDRESS="ja_JP.UTF-8"
LC_TELEPHONE="ja_JP.UTF-8"
LC_MEASUREMENT="ja_JP.UTF-8"
LC_IDENTIFICATION="ja_JP.UTF-8"
LC_ALL=ja_JP.UTF-8

#did it!
$ sudo yum check
Loaded plugins: fastestmirror, ovl
Repository google-chrome is listed more than once in the configuration
check all