[25023] | 1 | #!/bin/sh |
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[24348] | 2 | # |
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[25023] | 3 | # Change the IP/hostname on cluster machines |
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| 4 | # |
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[24348] | 5 | |
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[25023] | 6 | # Required for recovery-mode scripts |
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| 7 | if [ "$1" = "test" ]; then |
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| 8 | echo "Change IP address or hostname" |
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| 9 | exit 0 |
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| 10 | fi |
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[24348] | 11 | |
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[25023] | 12 | if [ "$(id -u)" != "0" ]; then |
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| 13 | echo "This script must be run as root." |
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| 14 | exit 0 |
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| 15 | fi |
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[24398] | 16 | |
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[24348] | 17 | |
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[25023] | 18 | # Blatantly stolen from the installer |
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| 19 | ask() { |
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| 20 | answer='' |
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| 21 | while [ y != "$answer" -a n != "$answer" ]; do |
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| 22 | echo -n "$1" |
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| 23 | read answer |
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| 24 | [ Y = answer ] && answer=y |
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| 25 | [ N = answer ] && answer=n |
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| 26 | [ -z "$answer" ] && answer=$2 |
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| 27 | done |
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[24348] | 28 | } |
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| 29 | |
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[25023] | 30 | bail() { |
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| 31 | echo |
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| 32 | echo "Cancelled. Press Enter to the menu." |
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| 33 | read dummy |
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[24348] | 34 | exit 0; |
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| 35 | } |
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| 36 | |
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[25599] | 37 | # Precise mounts root read-only in recovery mode. |
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| 38 | mount -o remount,rw / |
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| 39 | |
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[25023] | 40 | # sulogin gets upset if it gets a ^C |
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| 41 | trap bail INT |
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[24348] | 42 | |
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[25023] | 43 | PATH="/sbin:/bin:/usr/bin:/usr/sbin:$PATH" |
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[24348] | 44 | |
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[25023] | 45 | if [ "$DEBATHENA_DEBUG" = "1" ]; then |
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| 46 | echo "**********\nDEBUG MODE\n**********" |
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| 47 | MASKS="$(pwd)/masks"; |
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| 48 | NETPARAMS="$(pwd)/netparams"; |
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| 49 | . "$(pwd)/require_network.sh" |
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| 50 | else |
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| 51 | MASKS="/usr/share/debathena-recovery-mode-config/masks"; |
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| 52 | NETPARAMS="/usr/share/debathena-recovery-mode-config/netparams"; |
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| 53 | . /usr/share/debathena-recovery-mode-config/require_network.sh |
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| 54 | fi |
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[24348] | 55 | |
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[25023] | 56 | if [ "$DEBATHENA_DEBUG" != "1" ] && \ |
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| 57 | [ "$(machtype -L)" != "debathena-cluster" ]; then |
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| 58 | echo "WARNING: This script is designed for debathena-cluster machines" |
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| 59 | echo "but this machine is running $(machtype -L).\n"; |
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| 60 | ask "Are you SURE you want to continue? (y/N) " n |
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| 61 | if [ "$answer" = "n" ]; then |
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| 62 | exit 0 |
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| 63 | fi |
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| 64 | fi |
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[24348] | 65 | |
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[25023] | 66 | echo "Testing networking, please wait..." |
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| 67 | if ! require_network; then |
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| 68 | echo "Can't verify that networking is available. If you continue," |
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| 69 | ask "errors may occur. Continue? (y/N) " n |
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| 70 | if [ "$answer" = "n" ]; then |
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| 71 | exit 0 |
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| 72 | fi |
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| 73 | fi |
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[24348] | 74 | |
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[25023] | 75 | while true; do |
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| 76 | while [ -z "$IPADDR" ] ; do |
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| 77 | echo -n "Enter IP address: " |
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| 78 | read IPADDR |
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| 79 | done |
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[24348] | 80 | |
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[25023] | 81 | NETMASK=`$NETPARAMS -f $MASKS $IPADDR|cut -d\ -f 1` |
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| 82 | GATEWAY=`$NETPARAMS -f $MASKS $IPADDR|cut -d\ -f 4` |
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[24348] | 83 | |
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[25023] | 84 | echo "Address: $IPADDR" |
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| 85 | echo |
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| 86 | echo "Autoconfigured settings:" |
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| 87 | echo " Netmask: $NETMASK" |
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| 88 | echo " Gateway: $GATEWAY" |
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| 89 | echo |
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| 90 | ask "Is this correct? (Y/n) " y |
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| 91 | [ "$answer" = "y" ] || continue |
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| 92 | echo "Looking up hostname..."; |
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| 93 | FQDN="$(dig +short -x $IPADDR 2>/dev/null | sed -e 's/.$//')" |
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| 94 | if [ $? != 0 ]; then |
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| 95 | echo "Unable to look up hostname. You may enter it below" |
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| 96 | echo "but beware that typos may render your machine unusable." |
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| 97 | FQDN= |
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| 98 | while [ -z "$FQDN" ] ; do |
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| 99 | echo -n "Enter hostname: " |
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| 100 | read FQDN |
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| 101 | FQDN="$(echo $FQDN | tr -d ' ')" |
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| 102 | if echo "$FQDN" | egrep -qi "[^a-z0-9_-\.]"; then |
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| 103 | echo "Invalid characters in hostname, try again." |
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| 104 | FQDN= |
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| 105 | fi |
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| 106 | done |
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| 107 | fi |
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| 108 | if ! echo "$FQDN" | grep -qi "MIT.EDU$"; then |
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| 109 | FQDN="$FQDN.MIT.EDU" |
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| 110 | fi |
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| 111 | echo "Hostname: $FQDN" |
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| 112 | ask "Is this correct? (Y/n) " y |
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| 113 | if [ "$answer" = "y" ]; then |
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| 114 | break |
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| 115 | fi |
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| 116 | done |
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| 117 | HOSTNAME="$(echo "$FQDN" | cut -d. -f 1)" |
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| 118 | DOMAIN="$(echo "$FQDN" | sed 's/[^\.]*\.//')" |
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| 119 | if [ "$DEBATHENA_DEBUG" = "1" ]; then |
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| 120 | echo "$IPADDR $NETMASK $GATEWAY $HOSTNAME $DOMAIN $FQDN" |
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| 121 | echo "Done!" |
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| 122 | exit 0 |
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| 123 | fi |
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| 124 | echo "Updating /etc/network/interfaces..." |
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| 125 | mv -f "/etc/network/interfaces" "/etc/network/interfaces.old" |
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| 126 | cat <<EOF >/etc/network/interfaces |
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| 127 | # This file was created by athena-renumber |
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[24348] | 128 | |
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| 129 | # The loopback interface |
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| 130 | auto lo |
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| 131 | iface lo inet loopback |
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| 132 | |
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| 133 | # The primary network interface |
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| 134 | auto eth0 |
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| 135 | iface eth0 inet static |
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[25023] | 136 | address $IPADDR |
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| 137 | netmask $NETMASK |
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| 138 | gateway $GATEWAY |
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[24348] | 139 | dns-nameservers 18.70.0.160 18.71.0.151 18.72.0.3 |
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[25071] | 140 | dns-search mit.edu |
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[25023] | 141 | EOF |
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| 142 | echo "Updating /etc/hosts..." |
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| 143 | mv -f "/etc/hosts" "/etc/hosts.old" |
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| 144 | cat <<EOF >/etc/hosts |
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| 145 | # This file was created by athena-renumber |
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[24348] | 146 | 127.0.0.1 localhost |
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| 147 | 127.0.1.1 $fqdn $hostname |
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| 148 | |
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| 149 | # The following lines are desirable for IPv6 capable hosts |
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| 150 | ::1 localhost ip6-localhost ip6-loopback |
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| 151 | fe00::0 ip6-localnet |
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| 152 | ff00::0 ip6-mcastprefix |
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| 153 | ff02::1 ip6-allnodes |
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| 154 | ff02::2 ip6-allrouters |
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| 155 | ff02::3 ip6-allhosts |
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[25023] | 156 | EOF |
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| 157 | echo "Updating /etc/hostname..." |
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| 158 | mv -f /etc/hostname /etc/hostname.old |
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| 159 | echo $HOSTNAME > /etc/hostname |
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| 160 | echo "Setting hostname..."; |
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| 161 | hostname $HOSTNAME |
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| 162 | echo |
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| 163 | echo "Done! You will need to reboot the workstation for the changes to take effect." |
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| 164 | ask "Would you like to reboot now? (Y/n) " y |
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| 165 | if [ "$answer" = "n" ]; then |
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| 166 | echo "Please perform a full shutdown and reboot as soon as possible." |
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| 167 | echo "(Press Enter to return to the menu)" |
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| 168 | exit 0 |
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| 169 | fi |
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| 170 | reboot |
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