"WARNING: Setting locale failed" with CentOS8 on Docker

To fix:

dnf install -y glibc-all-langpacks

こんだけ。

docker コンテナのMTUを変更する - Changing container MTU on docker

dockerd の起動オプションに --mtu xxxx をつけると、ブリッジ docker0 とコンテナに接続されるvethのMTUを変更できる。

you put the option "--mtu xxx" on dockerd option, you can change docker0/veth MTU on docker.



MTUを変更するには、/etc/sysconfig/docker-network に "-mtu" を記述しておけばオーケー。

In order to change the MTU, you write "--mtu" into the file "/etc/sysconfig/docker-network".

# vim /etc/sysconfig/docker-network

DOCKER_NETWORK_OPTIONS="--mtu=1400"

# reboot

# ps -ef |grep docker
root      2019     1  0 Sep06 ?        00:00:13 /usr/bin/docker-current daemon --exec-opt native.cgroupdriver=systemd --selinux-enabled --log-driver=journald --mtu=1400

# ip link | grep mtu
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
3: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue state UP mode DEFAULT
7: veth845af41@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue master docker0 state UP mode DEFAULT
9: vethab65786@if8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue master docker0 state UP mode DEFAULT
11: veth7ae7d07@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue master docker0 state UP mode DEFAULT