Memo/Linux/resolv.conf

resolv.conf
- DHCP使用時にresolv.confを上書きしない

resolv.conf †

記事
- Man page of RESOLV.CONF
- /etc/resolv.confとタイムアウト秒 - Qiita

↑

DHCP使用時にresolv.confを上書きしない †

記事
- NetworkManager＋dnsmasqで名前解決の耐障害性を向上 | 外道父の匠

Memo/Linux/cloud-init#x901255cが書き換える場合もある

CentOS7.xだと「systemctl restart NetworkManager」とすると/etc/resolv.confが自動生成される
- NetworkManagerがインストールされていない場合、networkを再起動すると「/var/log/messages」「/usr/sbin/dhclient-script : updated /etc/resolv.conf」と表示され、書き換わるのを確認できる。
CentOS6.xだと「sudo service network restart」すると、/etc/resolv.conf が自動生成される。

固定IPで運用してる場合や、手動でDNSを設定したい時などは止めたい

NetworkManagerは使うが、resolve.confの上書きは止めたい場合

sudo bash -c "echo -e '[main]\ndns=none' > /etc/NetworkManager/conf.d/dns.conf"
sudo systemctl restart NetworkManager

# /etc/resolv.conf を書き換え後、再度NetworkManagerを再起動。
# 「dns=none」を入れてNetworkManagerを再起動した直後は /etc/resolv.conf が書き換わる

NetworkManagerを止める場合でも上記の設定は必要。また、NetworkManagerをアンインストールしても必要。
```
sudo service NetworkManager stop
sudo chkconfig NetworkManager off
```

DHCPを指定している ifcfg-eth0 に "PEERDNS=no"を追加する

sudo sh -c 'echo "PEERDNS=no" >>/etc/sysconfig/network-scripts/ifcfg-eth0'

または ifcfg-eth0 を書き換えて、networkを再起動すると resolv.confも変わる

sudo sh -c 'echo -e "DNS1=8.8.8.8\nDNS2=8.8.4.4" >>/etc/sysconfig/network-scripts/ifcfg-eth0'
sudo service network restart

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Memo/Linux/resolv.conf

resolv.conf †

DHCP使用時にresolv.confを上書きしない †

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