diff --git a/Linux_reinstall/RedHat/CloudInit/ipv4_static_interfaces.cfg b/Linux_reinstall/RedHat/CloudInit/ipv4_static_interfaces.cfg
index cbbd59f..1104b94 100644
--- a/Linux_reinstall/RedHat/CloudInit/ipv4_static_interfaces.cfg
+++ b/Linux_reinstall/RedHat/CloudInit/ipv4_static_interfaces.cfg
@@ -51,6 +51,12 @@ network:
 # Add new ssh port for firewalld.
 # Install epel repository and some common components.
 # Refresh dependents of systemctl.
+# Set english as default of language and locate to profile to provent "Failed to set locale, defaulting to C.UTF-8" by executing "dnf update -y".
+# Reference: https://linuxfan.info/locale-variables
+#   Chapter: カテゴリー別のロケール設定 and 環境変数「LC_ALL」が設定されていれば最優先される
+#            https://it-afi.com/linux/failed-to-set-locale-defaulting-to-c-utf-8-%E3%81%A3%E3%81%A6%E5%87%BA%E5%8A%9B%E3%81%95%E3%82%8C%E3%81%9F/
+#   Chapter: 全部のロケールをC（アメリカ英語）にする場合
+# Reload profile of bash.
 # Update grub2.
 # Delete cloud-init config file itself and disable it permanently after first execution.
 runcmd:
@@ -68,6 +74,8 @@ runcmd:
   - sed -i '7i \ \ <port port="sshPORT" protocol="udp"/>' /etc/firewalld/zones/public.xml
   - dnf install curl dnsutils epel-release file lrzsz net-tools vim wget -y
   - systemctl daemon-reload
+  - echo 'export LC_ALL="C.UTF-8"' >> ~/.bash_profile
+  - source ~/.bash_profile
   - grub2-mkconfig -o $(readlink -f /etc/grub2-efi.cfg)
   - rm -rf /etc/cloud/cloud.cfg.d/99-fake_cloud.cfg
   - touch /etc/cloud/cloud-init.disabled