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sudo: unable to resolve host が表示されたら

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sudo: unable to resolve hostが表示されたら、/etc/hostsにホスト名を追加します。

手順

まずは、/etc/hostsを確認します。

sudo: unable to resolve hostが表示されています。

$ sudo cat /etc/hosts
sudo: unable to resolve host foobar
127.0.0.1       localhost
127.0.1.1       hostname.domainname hostname

/etc/hostsにホスト名を追加します

$ sudo sh -c 'echo 127.0.1.1 $(hostname) >> /etc/hosts'

もう一度、/etc/hostsを確認します。

ホスト名が追加されたので、sudo: unable to resolve hostが表示されません。

$ sudo cat /etc/hosts
127.0.0.1       localhost
127.0.1.1       hostname.domainname hostname
127.0.1.1 foobar
ogomr
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